Here is the full list of all 20 Woolfe - The Red Hood Diaries achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Unlock 36 diary entries
Kill a Tesla guard
Kill 50 rats.
Be quicker than the dev's and finish A Forest Adrift in less then 4 minutes and 56 seconds
Finish the harbour on hard.
Defeat Woolfe on hard.
Chase Woolfe through the woods without dying.
Defeat Woolfe and listen to what Grandma has to say.
Discover all combo's
Kill 20 Fairies.
Visit the outhouse in the Forest Adrift
Defeat the Pied Piper
Unlock 18 diary entries.
Kill 100 kickstarter backers.
Escape the guards without dying.
Defeat the big rat.
Drown right after Red tells you she can't swim.
Find Reds axe
Roll...
Unlock 6 diary entries.