Here is the full list of all 12 Ms. Splosion Man achievements.
Complete all of the Single Player levels in Hardcore Mode.
Buy all of the unlockables.
Find Star Road.
Complete all of the Single Player levels.
Collect all 47 pairs of shoes in Single Player mode.
Complete Single Player level 3-14 without touching the ground.
Collect all 50 pairs of shoes in Multiplayer mode.
Complete all of the Multiplayer levels.
Download and play against a Ghost from a Leaderboard entry.
Complete Multiplayer level 2-14 without one of the players 'sploding.
Find a secret exit.
Destroy 10 pieces of scenery.