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