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