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