Here is the full list of all 22 Witch Hunt achievements.
Finish the game.
Kill 3 deadblind in one playthrough.
Kill the witch.
Find the book of the dead.
Kill the night flier.
Find the weird looking skull.
Unlock and visit every location behind locked doors.
Find all save stones in the game.
Destroy the sacrificial tree.
Unlock all skills in one playthrough.
Save a dog.
Unlock 5 chests in one playthrough.
Make 20 headshots in one playthrough.
Kill 50 enemies in one playthrough.
Kill the beast.
Fire a cannon.
Attack enemy with lightning using thunder totem.
Attack the beast.
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.