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