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