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