Here is the full list of all 22 Witch Hunt achievements.
Unlock 5 chests in one playthrough.
Destroy the sacrificial tree.
Find the weird looking skull.
Find the book of the dead.
Unlock all skills in one playthrough.
Kill the beast.
Find all save stones in the game.
Fire a cannon.
Make 20 headshots in one playthrough.
Kill 50 enemies in one playthrough.
Kill 3 deadblind in one playthrough.
Attack the beast.
Save a dog.
Kill the night flier.
Don't get hurt by a whisperer.
Unlock and visit every location behind locked doors.
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.