Here is the full list of all 22 Witch Hunt achievements.
Find the weird looking skull.
Find all save stones in the game.
Fire a cannon.
Destroy the sacrificial tree.
Unlock 5 chests in one playthrough.
Kill the beast.
Kill the night flier.
Make 20 headshots in one playthrough.
Unlock and visit every location behind locked doors.
Kill 50 enemies in one playthrough.
Save a dog.
Kill 3 deadblind in one playthrough.
Attack enemy with lightning using thunder totem.
Attack the beast.
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 book of the dead.
Finish game not using any silver crucifixes or watcher totems.
Finish game in perma mode.