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