Here is the full list of all 29 INMOST achievements.
Complete the Slime Pit scene without taking damage.
Gain all the achievements.
Complete the swamp scene without taking damage.
Complete the Snow scene without taking damage.
Complete the fire scene without taking damage.
Play without collecting any pain.
Talk to the cats when their sibling is dead.
Finish the final scene.
Kill all enemies as the Knight.
Discover what's in the attic.
Listen to all the rabbit's comments.
Discover the fountain.
Zero deaths as the wanderer.
Talk to the cats when their sibling is alive.
Listen to all the Storyteller's tales.
Collect all the Pain Crystals.
Find all the notes.
Kill all jumpers.
Listen to the Storyteller's first tale.
Host a Tea Party!
Get the Cookies.
Enter the mines.
Find the rabbit.
Complete the castle scene without taking damage.
Defeat the first hunter.
Save the cat from the hunter
Finish the Old Man Scene
Find a hidden Pain Crystal
Finish the Girl Scene