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