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