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