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