Here is the full list of all 22 Witch Hunt achievements.
Kill the beast.
Make 20 headshots in one playthrough.
Kill 50 enemies in one playthrough.
Unlock 5 chests in one playthrough.
Kill 3 deadblind in one playthrough.
Find all save stones in the game.
Kill the night flier.
Fire a cannon.
Attack enemy with lightning using thunder totem.
Attack the beast.
Destroy the sacrificial tree.
Don't get hurt by a whisperer.
Unlock and visit every location behind locked doors.
Unlock all skills in one playthrough.
Finish the game without dying.
Finish the game.
Kill the witch.
Save a dog.
Find the weird looking skull.
Find the book of the dead.
Finish game not using any silver crucifixes or watcher totems.
Finish game in perma mode.