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