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