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