Image: Rebel Wolves / Bandai NamcoOfficial screenshot from Rebel Wolves / Bandai Namco.
Creature of the Night is earned by buying an Ultimate Perk in the Vampirism tree. Unlike the other trees, it is gated by your Corruption level, so you need to feed a lot.
Raise Corruption to level 15 by drinking blood, then spend 4 points on an Ultimate Perk in the Vampirism tree. The trophy pops when you buy it.
Feed often during the night and use Voracious Bite to push Corruption up faster. Save before you spend points so you can reload and put them into Swordmastery or Witchcraft for the other Ultimate trophies.