Here is the full list of all 38 Creeps Creeps? Creeps! achievements.
Wear a Spartan Helmet.
Put on a helmet red helmet.
Equip ronin's armor and weapons.
Wear a space armor kit.
Put on a demonic kit.
Take a lightsaber.
Take the purple-gold sword.
Take the red lightsaber.
Take the Buster Sword.
Take the King protector.
Take a boomerang banana.
Take a card.
Take a batarang.
Take the golden boomerang.
Take Thor's hammer.
Kill 10 bees of any kind.
Kill 100 bees of any kind.
Kill 10 bees of the third species.
Kill 10 ghosts of any kind.
Kill 100 ghosts of any kind.
Kill 10 ghosts of the third species.
Kill 10 mushrooms of any kind.
Kill 100 mushrooms of any kind.
Kill 10 mushrooms of the third species.
Kill 10 slimes of any kind.
Kill 100 slimes of any kind.
Kill 10 slimes of the third species.
Kill 10 snakes of any kind.
Kill 100 snakes of any kind.
Kill 10 snakes of the third species.
Kill 1000 enemies of any kind.
Use 10 potions.
Die 10 times.
Accumulate 100 coins.
Accumulate 1000 coins.
Accumulate 10000 coins.
Defeat the boss.
Pull the sail and sail away.