Here is the full list of all 18 Crab Dub achievements.
Beat the game!
Unlock the final boss!
Third zone completed!
Second zone completed!
Chop 100 ice cubes!
First zone completed!
Destroy 10 missiles!
Destroy 10 apples
Jump 100 times on a space donkey!
Start the game on the little duck!
Start the game in space!
Inflate 10 kittens
Kill one Octopus
Pop 100 bubbles
Use 10 hearts
Jump 10 times on jellyfish
Activate the magic pill!
Start game for the Crab!