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