Here is the full list of all 24 Alfonzo's Arctic Adventure achievements.
Collect a Gold Fish
Collect 10 Gold Fish
Collect 20 Gold Fish
Collect 30 Gold Fish
Collect 40 Gold Fish
Collect 50 Gold Fish
Defeat Samsuin
Defeat Battsu the Maturity Elf
Defeat the Evil Snowbeast
Defeat the Easter Bunny
Defeat the Angler
Defeat Yuck
Beat the Game
Find a Secret Path