Full list of all 12 Super Meat Boy achievements worth 200 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox 360.
You got 100% on Super Meat Boy, start bragging!
You unlocked The Kid!
You've beaten the Cotten Alley all by yourself!
You completed the Dark World... you are awesome.
You unlocked Tim by collecting 50 bandages! He's weird...
You beat the game!... but that's not the end, is it?
You conquered 5 warp zones! you're so old school...
You completed a full chapter without dying! Good for you!
You unlocked Gish by collecting 10 bandages! Go you!
You unlocked Commander Video! Double rainbow all da way!
You just beat 10 levels without getting killed! Meat Boy loves you for that!
You found a warp zone! Now pay me for the door repair!