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