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