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