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