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