Here is the full list of all 16 Caterpillarnoid achievements.
Defeat the boss (hard/very hard)
Open 50 ammo boxes!
Defeat the boss
Get 100 000 score
-1 sec of poison duration
Destroy 150 enemy's projectiles or bombs
-0.9 sec of freezing duration
Collect 100 coins
Complete all levels with ships
Gather some flowers
Defeat 50 enemies
Break 1 000 bricks
Destroy 50 enemy's projectiles or bombs
Open 25 chests
200 fireballs
Don't give up!