Here is the full list of all 20 Guise Of The Wolf achievements.
Kill more than 10 humans.
Unlock the good ending.
Complete the game with less than 12 transformations.
Unlock the bad ending.
Complete the game without falling or being killed.
Prepare the “Wolfsbane”.
Complete the stone beacons task.
Prepare the “Night Watchman”.
Collect 230 Gold.
Rob all pockets.
Solve the card puzzle.
Find and read a book about your curse.
Unlock all chests.
Run and hide from the werewolf.
Learn how to use the werewolf form.
Survive the werewolf attack.
Unlock a normal sized wooden barrier without transformation.
Discover the reason for your invitation.
Realize your new identity.
Collect an optional item.