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
Be quicker than the dev's and finish A Forest Adrift in less then 4 minutes and 56 seconds
Kill 20 Fairies.
Kill 50 rats.
Kill 100 kickstarter backers.
Kill a Tesla guard
Chase Woolfe through the woods without dying.
Defeat Woolfe and listen to what Grandma has to say.
Defeat Woolfe on hard.
Discover all combo's
Visit the outhouse in the Forest Adrift
Defeat the Pied Piper
Finish the harbour on hard.
Unlock 18 diary entries.
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.