Collect a fish
Break a snow block
Clear a level
Switch to Alfonzo
Defeat Maurice the Pigeon
Poke the Walrus
Defeat the Yeti
Defeat Sams
Defeat a Flying Nose
Defeat a Spider
Defeat the Leprechaun
Defeat the Narwhal
Defeat Goatbreath the first time
Defeat Goatsbreath the second time
Defeat Goatsbreath the third time
Defeat Ogrehead