Here is the full list of all 31 The Forest of Doom achievements.
Find all the artwork in The Forest of Doom
Find all the painted canvas pieces to unlock alternative cover
Be fired upon by arrows in four different encounters
Find the ultimate ending in Medium mode
Find the ultimate ending in Hardcore mode
Find the ultimate ending in Free Read mode
Find the two halves of the dwarfish hammer
Tame a flying beast with music
Face a barrage of eggshell splinters
Reveal the truth about an individual
Release an Earth Elemental on to the world
Get caught in an Ogre's tree trap
Return a brass bell to its owner
Successfully use the Net of Entanglement
Ride a strange looking horse
Fight a creature that has been darted
Eat a strange fruit
Find your new destiny
Bounce your way out of trouble
Use an aromatic bulb to ward off a night terror
Help two souls out but be duped each time
Win an arm-wrestling contest
Kill a creature who hates 'bwight light'
Suffer at the hands of lycanthropy
Escape Darkwood Forest!
Be unlucky in a 'Test your Luck' roll
Fight a feline foe
Wield a carrot as a deadly weapon
Be lucky in a 'Test your Luck' roll
Buy all of Yaztromo's items
Fight the iconic Shapechanger!