It's not an achievement, but this is pretty rare

What about the inverse?

I got Satisfactory before the 1.0 release. I played most of the game before achievements were added. Now the achievement for "reaching the credits" is achieved but "finish the tutorial" is still waiting to be done.

0.4%

Not as rare as some others, but takes a little while to achieve:

Rarest

Proudest (Love this game, highly recommend)

I'm this many years old on Steam and don't know how to find my achievements on the mobile app.

Not as low as some other percentages in this thread but I was very proud to beat the last pantheon in Hollow Knight. You have to beat every boss in the game in a row without dying

This thread is a self doxxing minefield

Somehow I'm among the 6.1% of Stanley Parable players with this one.

Close to my rarest, but very fun and surprisingly strong! From Victoria 3

0.2% in CK3.

Not at all an achievement hunter, and Steam is not my default gaming platform...

But I checked my rarest achievements and I've got a 1.4%. Which does not sound much, except it's in fucking Skyrim, and absolutely trivial to get.

OK, there's the catch : it's because this is Skyrim VR. It's the achievement you get just for mining ore and chopping wood.

Looks like there are some relatively easy .3/.4% to get there if you've got a VR headset and some dedication. And manage to keep the game working long enough to get those. That might be the hardest part, because ... Bethesda.

Terraria, 0.4%

Not strictly my rarest

But I remember taking a good while to actually achieve it (FTL)

Thank you for asking!

My rarest achievement (0.3%) and most of the other rare ones were mainly for winning the Godly difficulty of the Neter campaign on From The Depths with my own creations. Each faction was its own achievement.

My second-rarest (0.4%) and proudest achievement is my tenth dan black belt in Toribash. I'm really close to custom belt but I haven't played in like 20 years. Oh my god.

Lazy Bastard, Getting On Track, Raining Bullets, TIS-100, and a couple Noita ones

Napoleon Total War. Not sure if I was achievement hunting or not but it sounds fun.

Shadows of Doubt. These achievements are not rare because they are difficult, but because they are tedious. Most of the ones listed here are just repeatedly eating a food item, which costs almost nothing (1200 credits for solving a typical case, 700 for an easy case; 12 credits to buy a Croque Monsieur, the most expensive food in the game.)

Rat Catcher: Solve a murder while your PoV is at the ground, but you can crawl up walls, and also nobody will talk to you. This achievement is rare mostly because this game mode was added a few years after this game peaked in popularity.

Spare No One: KO everyone in town, in a game where you are discouraged from using violence. Finding a katana and knocking out everyone you see on the street is easy enough. The real challenge here is keeping track of everyone. Some NPCs glitch out and get stuck in their houses, never go outside, and never come to work. You'll have to identify them, find out where they live, and hunt them down. Some NPCs have accented characters in their names, making them difficult to search for on the computers in game, which do not allow you to type such characters.

If you make a case board to keep track of everyone, the case board takes exponentially increasing time to open for each person you pin onto it. By the end, it was taking me about 5 seconds each time I opened it. That was in a custom procedurally generated town of the smallest possible size -- it would be worse on any of the stock towns.

Out of the Red: pay off 10,000 to a loan shark in 1,000 credit increments, one payment per day. Raising 10,000 can be done in half a day easily. Paying it off takes for ever. You can't make payments early. Each one-day wait takes a few minutes, since the game has to simulate every NPC in town. And remember to turn off the procedurally generated murders, because otherwise your loan shark might get killed, and you can't make payments any more (it happened to me, and I had to load a save.)

Watch_Dogs, 0.2% achievement

My two rarest aren't that rare. I'm not an achievement hunter.

I only have 20 Civ 6 Achievements, and one this one is also my rarest steam achievement somehow. Pretty sure it's just a thing people don't try, rather than being hard.

GTFO 0.2%

After that I’ve just got a bunch of ones from Risk of Rain 2 from just unlocking everything. Pretty time consuming, but very much a brain off game.

I don't have it on Steam yet, but I have Balatro's Completionist++ on mobile.

I'm working on getting it on Steam too. Once you've done it once, getting it again isn't hard, just time-consuming. It's a 0.2% achievement, I think.

Oh Nosgoth, we hardly knew ye...

this is a free game, but I don't think there are a lot of people who have played it (delivery & beyond).

otherwise it'd be these for tabletop simulator

I am kinda saddened that it's such a mundane achievement but I'm also baffled because I didn't even go out of my way to get this one I just played normally

apparently this, which is weird as it just requires you to get 500 kills with the Winchester Super X3

That one is from Witch It!, but it's bullshit, most of their achivements have those kind of extra conditions that make them hard to get (but also to prevent just cheesing them playing on an empty server so I guess that's fair)

From Wolcen: Lords of Mayhem

This, from Tabletop Simulator.

Software Inc. Apparently people don't like it when you take away their company car, vacation pay, end of year bonus, and end of year pay increase. Who knew.

probably this badge

as for strictly achievements, looks like it's from human fall flat. that game just spams you with achievements though.

My rarest achievement is for getting 32 silenced revolver kills in Red Orchestra 2 (0.3% of players). Technically its not too difficult, but since its a shooter with a fairly low TTK, you don't normally use the sidearm much. Further the silenced revolver is a pristige varient that has to be ground out using the original revolver, and performs worse than the unsilenced, so there is no reason to get the achievement except for completionism sake.

The achievement I'm much more proud of is Crypt of the Necromancer's Vow Down, for completing a full roguelike run with Monk. The gimmick with Monk is that the game is its normal roguelike-on-a-beat, but if you touch any gold, be it an enemy's drops or dungeon loot, you die instantly 100 to 0. This means that as well as the normal difficulty of the game, you have to plan around where you kill enemies to ensure that you always leave a safe path. I'm pretty confident that this is the most difficult thing I've ever done in a game. Technically 0.7% of player have the achievement, but given that 0.3% also have the achievement for completing the impossible New Game++++++++ character, we can effectively call it as 0.4% of players.

This one I think =w=. I don't particularly care about achievements or getting rare ones, so I don't have any super extremely rare ones

From American Truck Sim

Cornfusion Drive to the center of the Evergreen cornfield maze (requires Illinois DLC)

It says .1% of players

"Derpin' With Turpin" in Tactical Intervention.

IIRC you get this under the craziest of conditions:

• You need to snipe 2 players with 1 shot who are in a car moving at max speed while you are also in a car moving at max speed, while fully zoomed in on a sniper rifle

• One of the two developers (Turpin) has to be on the server with you

Last I checked, it had an earn rate of like 0.03%. The condition of playing with one of the actual developers of the game is what makes it super hard; not really the sniping (tho that is also super difficult). It's probably not even earnable now; I got it back when the game was still being beta tested.

Edit: Got curious and went to find the actual stats for the two rarest achievements I have according to the "rarest achievements" block on my Steam profile (cuz there is 1 even rarer than the one I mentioned above), but the data isn't accessible. The rarest one I can actually see global stats for is 2nd Dan Blackbelt for Toribash (0.8%).

Ah I see witch it.

0.4% Pillars of Eternity 1: No Rest for the Pro. Complete the game with fewer than 10 rests.

Heart of the machine, 0.4%

Rarest: Some random achievement in City Skylines that I didn’t even notice I got

Proudest: Embrace the Void and 112% in Hollow Knight

Most are DLC specific or from old games.

It's not so rare now; but on the second day Silksong was out, I got the achievement for defeating Phantom when it was still 0.1%

Factorio Express Delivery was quite an effort and a lot of fun.

I also have some fun Europa Universalis 4 achievements that were at 0.1% when I got them, but it seems that I need to up my game there :P

I lost the screenshot, but i was the first one who beat crab champions on prismatic difficulty. My friend beat it a week later and was the second one. I never cared for achievements at all in video games, but seeing the 0.0% turning into 0.1% was bretty neat. It's a niche game, but i assume, just like me someone kept looking at that achievement, hoping it wouldn't flip over before they beat it.

Divinity: Original Sin 2 A friend and I managed to finish the honour run in less then 10 tries. It was awesome at the end. I played as Sebille and he as the red prince.

My top 6 rarest are 0.4% - 0.6%, all in Eternal Card Game, just because they were still adding achievements after 90% of the player base had already left.

Definitely not as rare as most of y'all and probably only as rare as it is because of how many millions of people play stardew valley without ever even trying the arcade machines.

Red Orchestra 2

0.3%

Silent Killer

Get 32 Kills with the silenced Nagant Revolver

Man what an awesome game, I miss it

My two rarest achievements are for playing the objective in certain Lawbreakers gamemodes. I imagine these weren't intended to be ultra-rare but fate had other plans.

There are now third party servers to play on but they can't unlock steam achievements

Finished Hollow Knight 100% in Steel Soul. I don't typically chase achievements. I knew finishing Steel Soul was one, but didn't know if 100% would be another.

My rarest achievement is from The Long Dark (Finely Tuned) at 0.1%. But that's because not many people played the last episode when it came out.

My most memorable is from Titanfall 2 (...Becomes the Master) Place in the top 3 of the Gauntlet scoreboard. That one is at 2.9%

new one from an update in March, so will probably drift down the list:

long-term rarest:

all my remaining rarest ones are from Civ 5, I guess most players don't have the DLC

This one, and the same achivement on American Truck Simulator.

How do you check again how many copies a game sold?

Because I have some 1% achievements in games that sold millions, but I'd argue my "20% of players" achievement in a 200 reviews game is rarer.

Two of my rarest: Dune Awakening

Dispatch

My overall showcase

And probably my proudest accomplishment

Not extremely rare but this achievement almost me rage-quit.

Back when RDR2 was fresh on PC, dinked around once with the death match modes and never again lol.

I have the "Edward Kelly" achievement in Kingdom Come Deliverance due to brewing 15 types of potions. Only 3.3% of players have it, which is pretty high compared to most of the ones posted here, but it's still a little interesting. Brewing potions in the game is a bit boring, and you can easily buy all the ones you need, so it's understandable why few people would get it. I just kinda decided one day I wanted to get to auto-brew level of skill and that meant lots of potion. Might as well make as many different kinds as I can, and auto-brew requires you've done it once already anyway.

Even silksong came out I got the achievement for fourth chorus when it had a 1% completion rate

Mine is nothing special. It's Architect of Ruin from Shotgun King. You get it for doing some minor progress in the new-ish (not really anymore, but it used to be new) Charnier mode, nothing challenging at all, but I assume the reason only 0.6% of players have it is because everyone moved on from the game before that content dropped.

Not counting rare ones that are from brand new DLC, this is my rarest (Stellaris).

With another rare from a different space 4x game (Endless Space 2):

Edit to add the one I am the most happy with (Noita):

My sibling, why would you ever play witch it on an official server?

All my latest most rare achievements are all from Megabonk, which IMO don't really count. They are easy to get if you just play long enough.

My rarest for a very long time was this one with something like 0.3%, but it has apparently since gone way up. It used to have one of those gold borders around it indicating it was very rare. I got this on my second round that I played and then quit pretty much right after that. Not a very good game, unfortunately.

The one I am most proud of is this one:

I got bored after I took over Britannia as the Britons and had no more enemies who could realistically challenge me, so I sailed directly down to Rome with my army of slingers and tribesmen and sacked Rome for something like 100k denarii.

EDIT: Well, nevermind, this is my newest rare achievement (for now)

Is there an easy way to find out without using third party websites?

One of the rarest achievements I have is not at all difficult. It's not even trying to be. It's on Street Fighter 5 for saving 30 replays. Apparently nobody does that?

Some test achievement for a game I was developing, to check that the achievement integration and unlocking worked as expected. It later got replaced by the real achievements, but my Steam rarest achievement showcase still shows it, so I’m happy to keep it for the lols. Probably only me and a couple QA folks could possibly have it. Well and cheaters of course.

I have all the achievements for Final Fantasy 1

I've got quite a few <0.1% from Lost Ark, but it doesn't feel like they count since it's a free to play MMO, so the account numbers are bloated.

After that I have a 1.8% from Forza Horizon 4 (30 stars on Skill Streak) and Frostpunk (Build the generator in the DLC mission).

My top 20 rarest achievements according to steamvault were all dirt rally ones about beating easy stage times...

Not many people played dirt too seriously it seems 😄

I got this through sheer indecisiveness on my first playthrough.

Apparently, completely finishing any Lego game (I have, at this point, completed 6 of them).

What game is that?? Ive done something similar in Gamble With Your Friends but there's no achievement for that in the game XD

This is my rarest but it's a small part that nobody plays of a niche game.

0.2% - American Truck Simulator

Shining Star
Obtain 3 stars in any 3 scenarios played in a row in Truck Driving Proficiency (Driving Academy)

The one I'm proud of:

0.3% - Halo: Master Chief Collection

A Preference for Pain
Halo 3: Complete the Halo 3 LASO Campaign playlist.

This one is the rarest of the game

This one is less rare but actually more difficult. Far more people attempt it so it has a higher achievement rate.

3.1% of players for Dungeons of Dredmor

The cactus simulator one. That was a lot of standing.

There’s a lot of achievements on this game that barely anyone has