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.
All achievements
Achievements they've won
Achievements they've not won
100% the game
Complete the Cotten Alley.
Find and unlock The Kid.
Complete the Dark World.
Complete the main game.
Collect 50 bandages.
Find and complete 5 warp zones.
Complete a full chapter without dying.
Complete 10 levels consecutively without dying.
Collect 10 bandages.
Find and unlock Commander Video.
Find and unlock a warp zone.