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