Here is the full list of all 14 Curse That Magic Cat! achievements.
Win the tutorial
Complete all levels
Earn three stars in a level
Earn three stars in all levels
Complete a level without being seen by the wizard
Unlock all cat colors in the game
Break all the objects in a level
Finish any one level 10 times
Stand on the spell book for 10 seconds.
Find the secret room.
Break 50 potions total
Break 10 maelstrom potions total
Meow 100 times total
Collect 30 spellbooks total