Here is the full list of all 12 Krinkle Krusher achievements.
Knock back the King with spikes and tornados.
Complete every stage with 3 stars and get all magical gems.
Imprison the King Krinkle forever!
Upgrade the 5 elemental rings to level 5.
Defeat the Kranium Krinkle.
Feed Kranium with some spicy krinkles!
Get all spells.
Defeat the Mecha Krinkle.
Knock back the Mecha Krinkle with his own bomb.
Unlock the workshop
Use an elemental krinkle explosion to kill 4 other krinkles
Show who's the best by defending the castle!