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