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