Full list of all 48 Super Meat Boy achievements.
The base game contains 41 achievements, and there are 3 DLC packs containing 7 achievements.
Spend as little time as possible in Hell
Spend as little time as possible in The Forest
Spend as little time as possible in The Salt Factory
Spend as little time as possible in The Rapture
Spend as little time as possible in The Hospital
Complete a single level of "The Kids Xmas" chapter in super meat world
Complete all levels in "The Kids Xmas" chapter in super meat world IN ONE PLAY SESSION.