Beat hazard (Game) - cool Tracks (Achievement) - 6.8%
Funny thing is you just have to click a link in credits to achieve this :P

Civilization V - Nobody expects... - 0.9%

Achivement?

Metro 2033 - Sterling Effort 0.5%

LOL!

Saints Row: The Third -> Gellin' Like Magellan 0%

Alan Wake:
Licensed Properties
Special 2: Discover 10 Night Springs video games.
0.8%

Portal 2 - Talent Show - 1.7%
Counter Strike: Source - Cowboy Diplomacy - 1.6%

Most played game with achievements: Killing Floor
Achievements progress: 100%
Rarest achievement done by users: One Giant Leap (Back) for Mankind -
Beat Moonbase on Hell on Earth 0.5%

Best and rarest achievement got from all games: F.E.A.R 3: Completionist -
Complete every challenge at least once 0.3%

I got some of the Ys I-Achievements whos global% is 0.
Noone can beat me :P

TF2 - The Fight Stuff 1.3%

Dogfighter: Promotion: Lieutenant Colonel ~ (The very air quakes as you fly!) - 0.3%

Golden God - The Basement Collection , only 0.5% have it. :)

BoI, Platinum God: 1.1%

Avadon: The Black Fortress - Nathalie Will Be Pleased - 0.4%

Anna (5,4 hours on record)
Speedrun 0.4%

PVZ 20/21

"Better Off Dead" - 7.1%

CSGO: Piece Treaty
Win 250 Pistol Rounds in Competitive Mode 0,9%

Bastion - Hard Bargain (0.4%)
Hard Reset - Exile: Crush'em! (Tier: Hard) (0.4%)

Bastion - Hard Bargain - 0.4%
Secret of the Magic Crystal - End Game - 0.7%
Lara Croft and the Guardian of Light - Tomb Raider - 1.6%

Now we have to wait for Fluffy ...

Pirates, Vikings & Knights 2 - Street Sweeper - 0%

Torchlight 2 - Ice Breaker - 0,1% (I just got it).
But I'm more proud of Super Meat Boy - Missile Boy - 0.6%

Spiral Knights - Expert Shieldbearer (Amass 5 shields in your Arsenal) - 3.7%
Blocks That Matter - I MAED A L3V3L W1TH BL0CKS 1N IT!!!1 (Playtest a level you’ve created with the ingame level editor) - 3.3% - You just have to put some blocks in the level editor, then press the button to test it xD
Wizorb - No Bubble Wrap (Complete a bonus level without bursting a bubble) - 2.0% - Another easy cheeve, you just enter a bonus level, then lose the ball before touching a bubble.
Dungeons of Dredmor - Canadian Pride (Equip the Maple Shield AND the Toque of Kanada) - 3.3%

XCOM
Lone Wolf Clear a UFO crash site with one soldier on Classic or Impossible difficulty. 1.0%

L.A. Noire - The City Of The Angels - 0.4%.

"Doctorate" in Deus Ex HR with 0.9%
"Trying Anything Once" in Just cause 2 with 0.9%

Half Life 2
vorticough - 3.8%
singing vortigaunt in water hazard

Killing Floor
game over man - 1.9%
20 zeds killed after slowing with zed

Spiral Knights
master gunslinger - 1.1%
amass 10 guns

P.A.M. (i don't care what everyone thinks - i love this game)
demolition mission - 1.0%
kill 100 in arcade hard