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