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