Here is the full list of all 12 Castle of Illusion Starring Mickey Mouse achievements worth 400 gamerscore.
Unlocked a Castle Painting.
Collect all the Magic Playing Cards.
Collect all of Donald's Chili Peppers.
Complete the Game.
Complete a Castle Statue.
Complete all Castle Statues.
Find 50% of all Magic Diamonds.
Find all the Magic Diamonds.
Break the illusion of 75 enemies.
Bounce on 7 enemies in a row without touching the ground
Break the illusion of 25 enemies with projectiles.
Complete a stage in Time Attack mode.