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