Here is the full list of all 28 Spell Casting: Meowgically Enhanced Edition achievements.
You passed the book 5 exam.
You passed the book 4 exam.
You have cast 255 spells.
You passed the book 3 exam.
You passed the Christmas Exam!
You have cast 127 spells.
You passed the Halloweeen Exam!
You passed the book 2 exam.
You cast every spell in book 2 perfectly!
You have cast 63 spells.
You must like screenshake!
You have cast 31 spells.
You have cast 15 spells.
You watched all the credits. Thanks!
You touched the candle flame.
You chatted with Wizard Purrcival Floof.
You passed the book 1 exam.
You cast every spell in book 1 perfectly!
You have cast 7 spells.
You have cast 3 spells.
You recieved 95% or better on a spell.
You cast a spell! Don't byte off more than you can chew.
You cast every spell in book 3 perfectly!
You cast every spell in book 4 perfectly!
You cast every spell in book 5 perfectly!
You cast all 30 spells perfectly!
You cast every spell in the Halloween book perfectly!
You cast every spell in the Christmas book perfectly!