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