Here is the full list of all 22 Ocean's Crabellum achievements.
Bang 150 Bombs
Kill 50 GunFishes
Kill 100 GunFishes
Kill 150 GunFishes
Kill Hammerhead
Kill 150 Eels
Kill 500 Eels
Kill 1000 Eels
Eat 75 сrab sticks
Destroy the saw-fish
Defeat Octo
Defeat 150 Stars
Defeat 300 Stars
Defeat 500 Stars
Kill 75 Needles
Kill 150 Needles
Kill 250 Needles
Bang 50 Kamikaze
Bang 250 Kamikaze
Bang 500 Kamikaze
Die 50 times
Pass the first level