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