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