Here is the full list of all 29 INMOST achievements.
Kill all enemies as the Knight.
Gain all the achievements.
Play without collecting any pain.
Talk to the cats when their sibling is dead.
Find all the notes.
Collect all the Pain Crystals.
Finish the final scene.
Complete the Snow scene without taking damage.
Listen to all the rabbit's comments.
Discover what's in the attic.
Discover the fountain.
Zero deaths as the wanderer.
Talk to the cats when their sibling is alive.
Listen to all the Storyteller's tales.
Kill all jumpers.
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.
Listen to the Storyteller's first tale.
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