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