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