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