Here is the full list of all 34 Tormentum - Dark Sorrow achievements. It takes around 4-5 hours to unlock all of the achievements on Windows.
End the game as evil
Enter the portal
Reveal the winged creature's hiding place
Renovate 30 paintings in the Painter's cathedral
Look through the hole in the wall in the catacombs
Set the Jester free
Start the train
Give the treasure from the tombs to the inhabitant of the tower
Save the prisoner from the well
Look at the picture over the mantelpiece in the rat's hut
Give the storm egg to the tree creature
Read all books
Find the mysterious drawing in the mines
Escape the castle
Release the wasteland dweller from the cage
Prepare the poisoned meat
Kill the woman imprisoned in the cage
Release the spider
Fully release the spikes in the torture device
Kill the wasteland dweller by opening the cage floor
Free the woman from her cage
Fix the machine in the sewers
Hide the blades in the torture device
Give the storm egg to the winged creature
Drop the prisoner down the well
Give the treasure from the tombs to the inhabitants of the wasteland hut
Don't reveal the winged creature's hideout
Destroy 3 paintings in the Painter's cathedral
Examine every painting in the Painter's cathedral
Leave the Jester for certain death
End the game as good
Collect all notes
Finish the game without using the notebook
Look at all roadsigns