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