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