Heart of the machine, 0.4%

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Even silksong came out I got the achievement for fourth chorus when it had a 1% completion rate
Napoleon Total War. Not sure if I was achievement hunting or not but it sounds fun.

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).
Ah I see witch it.

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%
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.

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.
Not quite official figures, but SteamHunter can show rarest achis in terms of absolute user numbers, and yea most of mine are from very obscure games, or games where the unlock was bugged for most players.
I'm not sure, usually it's the publishers sharing that number, Steam does tell devs how many copies they sold
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.


Somehow I'm among the 6.1% of Stanley Parable players with this one.
I'm number 10 on the Stanley Parable Worldwide Leaderboard.
And how does a person actually get it?
Supposedly you just get it randomly, or posts on the web say you can modify an config file then use a console command to get it.
the developer kept changing the unlock criteria to deliberately troll the players - while it's appropriate for the meta commentary of the game, it made sure I'll never play one of his games again D:
That's the point - they don't.
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.

Damn, how many tries did that take and how high was your adrenaline level during that playthrough?
It's not as bad as you'd think. I got it on my first attempt after playing through the game normally a bunch of times. Knowing where things are and what fights you can take in which order keeps things manageable.
And dream fights also do not kill you. So some of the toughest fights in the game will not end a steel soul run.
Plus 100% in Hollow Knight isn't everything. There's a total of something like 113%, so you don't need to do some challenges you know you might die to.
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.
Brewing potions is so fun in this game. But i don't have the achievement because there are some that i never used therefore never brewed
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.
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.
I love balatro so much, but i'm also really bad at it. I don't think i'll get anywhere in this game ever. But enjoy every second of failing
Not as rare as some others, but takes a little while to achieve:

I also got that one fairly.
Hahaha I have that one, and got it fair and square.
Ohh, right. Thanks for reminding me that I can get this one now.
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.
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.

Oh Nosgoth, we hardly knew ye...

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.

Not at all an achievement hunter, and Steam is not my default gaming platform...
But I checked my rarest achivements 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 manege to keep the game working long enough to get those. That might be the hardest part, because ... Bethesda.
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.
Close to my rarest, but very fun and surprisingly strong! From Victoria 3 
This thread is a self doxxing minefield
ah fuck, now everyone will know that I'm actually a trash girlfriend alt account
Are achievements public?
Depends on your steam profile settings
It's not an achievement, but this is pretty rare

Can't figure out how to post an image, but I have you beat by less than 24 hours! (September 15th, 2003)