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