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