Here is the full list of all 22 Witch Hunt achievements.
Unlock all skills in one playthrough.
Finish the game.
Kill the witch.
Destroy the sacrificial tree.
Kill the beast.
Kill 50 enemies in one playthrough.
Find all save stones in the game.
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 and visit every location behind locked doors.
Unlock 5 chests in one playthrough.
Finish the game without dying.
Kill 3 deadblind in one playthrough.
Save a dog.
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.