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