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