Here is the full list of all 15 Mystik Belle achievements.
Complete the game with the true ending.
Never leave a room without a hall pass.
Get the game's "good" ending.
Detonate a cave-in.
Pick up every item in the game at least once.
Travel to another world.
Discard all the fluff items
Retrieve an item from a pool of darkness.
Find the first piece of lore.
Create a replacement metal gear.
Assemble a Jeyden Jar.
Get zapped by a kitteh.
Get rid of the carnivorous plant.
Give the lizard its home back.
Complete the game under an hour.