The The Old Hunters Add-on for Bloodborne has 6 trophies - 4 bronze, 1 silver and 1 gold.
Defeat Great One: Orphan of Kos.
Defeat the beast that was once Laurence, the First Vicar.
Defeat Lady Maria of the Astral Clocktower.
Defeat the failed attempts to become Great Ones.
Defeat the beast that was once Ludwig, the Holy Blade.
Acquire all old hunter weapons.