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