Your rarest steam achievement.

Shogun 2 :Dishonoured Foe --> 0.27%

"By the Gods" from Crusader Kings II, only 0.45% of players have it. (Which doesn't really say much, with it requiring a DLC and the use of Ironman mode.)

Sword of the Stars: The Pit Demo => Educatio Decimus Facilis => 0,73%

Dragonrider and Master Architect from Skyrim
"Colonize this!" from Civ 5
All are 2%, damn it...

The Cave: Don't Fill Up On Fortune Cookies (1.4 %)

Postal 2 - You Snow Nothing John Blow 0.42%

The icon for this is amazing, Postal 2 has some of the best achievement icons haha.

Mine if Flight Club Rookie from Wings of Prey. 0.49% have it. Closely followed by, at 0.49%, Radio Free Europe from Civ V (though that one requires an expansion, so it's borderline cheating).

"The Old Citrus Changeup" in Miasmata, which involved facing your worst fears, then throwing an orange at it (0.46%)

Endless Legend - Endless Day
Steam says that 0.03% have this one :)

according to my showcase, I have two, both from Red Orchestra 2/Rising Storm, both at 0.03%

Stick it to Tojo
As an Allied soldier, kill 100 Axis soldiers with a bayonet

Riding Shotgun Silver
Kill 100 enemies with an on-board machine gun

Looks like it's from Unepic - THE GRAVEYARD IS OVERLOADED! (0.4%). 10000 kill task is kinda grindy.

Eternal Samson (0.14%) from The Binding of Isaac. But these Eternal achievements are rather new so they'll become a bit more popular soon. The next one which has a constant amount of achievers for a long time is Never take our freedom! (0.22%) from Civilization V.

Hi.I want to create some giveaways to level up and I see some people gifted about 200 dollors and there arent many repeated games in their giveaway list and their level is 2 and some others gifted about 20 dollars and their level is 2.anyone know why?thanks for help

Take you pick (0.83%) from Ace of Spades.
"Kill 10 enemies with the pickaxe."

10000 crits in torchlight II with 0.57% of the players

Secret of the Magic Crystal - End Game (By the power of the Magic Crystals I was able to bring this Story to a Happy Ending!)

AoE II - Hero of the Indians - 0,12%

classic example of how rarest doesn't mean hardest :)

sanctum 2
Better late than never
Reach rank 50. --> 0.4%

Pliskeblaske --> 0.6%
Complete Coastline with 5 Feats of Strength enabled

used to be some achievements from Orion prelude, but after the last update. It seems everyone gets the rare achievements...

Architect from Planetary Annihilation. (0.28%)

Even Steven from Payday 2 0.91% have it. In the Alesso heist job, get your seven bucks back. Unlocks the "Cantus" mask, "Bionic" material and "Circle Raster" pattern.

The Core from The Incredible Adventures of Van Helsing II - 0.29%

Over a Thousand! from Europa Universalis IV (0.31%)

An Army Of Four from XCOM: Enemy Unknown - 0,64% people have it.