Here is the full list of all 27 Through the Woods achievements. It takes around 3-4 hours to unlock all of the achievements on Windows.
You need two to make a pact
Complete chapter 5
Complete the game!
Found all folklore items
Found all collectibles
Read all texts
Complete Chapter 4
Relieved Garm from his pain
Found all abandoned children
Killed by a draug
Opened all doors
Found all dwarven gates
Completed chapter 3
Found the Red Hood
Killed by one of the brothers
Complete Erik's Cabin
Found the little heroes' toys
Completed chapter 2
I live, I die, I live again
Killed by Særimne
Found Pesta, the plague maiden.
Killed by Huldra
Found all reflectors
One was the king who won, two were defeated
Killed by a troll
Completed chapter 1
Completed chapter 0