Here is the full list of all 22 Witch Hunt achievements.
Kill the beast.
Unlock and visit every location behind locked doors.
Kill 50 enemies in one playthrough.
Unlock 5 chests in one playthrough.
Find all save stones in the game.
Kill 3 deadblind in one playthrough.
Fire a cannon.
Kill the night flier.
Find the weird looking skull.
Save a dog.
Make 20 headshots in one playthrough.
Attack the beast.
Destroy the sacrificial tree.
Don't get hurt by a whisperer.
Unlock all skills in one playthrough.
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.