Here is the full list of all 20 Super Phantom Cat achievements.
Complete Mystic Forest
Complete Lost Garden
Complete Torrid Oasis
Complete Glacial Valley
Complete Dark Spire
Complete Ancient Tree
Unlock The Character Ina
Buy 50 keys
Open 50 Golden Chest
Collect 10000 Coins
Receive 5 Crowns
Receive 15 Crowns
Receive 25 Crowns
Finish The Game with All Collection
Frighten The Timid 200 Times
Receive Cheers 200 Times
Kill 500 Monsters
Unlock The Character Alpha
Unlock 10 Characters
Unlock All Characters