Quick and Easy way to get this is to buy a gear pack from the in-game store.
*** Spoiler - click to reveal ***Not sure what level you need to be to wear these, but here's the info from the store
Armor only (Gear tab)
Spartan Renegade Armor - 500H
Nemean Lion Pelt - 500H
Pegasos Armor - 750H
Hades's Champion - 750H
Armor + Mount + Weapon (Packs tab)
Spartan Renegade Pack - 1000H
Nemean Lion Pack - 1000H
Pegasos Mythical Pack - 1500H
Underworld Mythical Pack - 1500H
OR
Probably your first/best FREE chance to get this is when you finally eliminate all 5 underling cultists in the Eyes of Kosmos branch of the Cult of Kosmos. You should get all 5 pieces of the
Snake Set of Legendary armor from those cultists. The Sage of each branch carries a legendary weapon, not armor; so the Sage is not necessary to get this trophy.
Snake SetHead = Viper's Hood
Arms = Venom Gloves
Torso = Scaled Torso
Waist = Slithering Belt
Legs = Noxious Boots
All the Legendary Sets that I've seen:
*** Spoiler - click to reveal ***Pirate
Pilgrim (sacred temples)
Greek Heroes (Mercenary drops)
Snake (Eyes of Kosmos cultist drops)
Agamemnon (The Silver Vein cultist drops)
Athenian War Hero (Delian League cultist drops)
Spartan War Hero (Peloponnesian League cultist drops)
Arena Fighter (arena contender drops)
Achilles (Heroes of the Cult cultist drops)
Amazon
Immortal (Worshippers of the Bloodline cultist drops)
Pegasos (store)
Spartan Renegade (store)
Nemean Lion (store)
Hades (store)
store = Menu store, not in-game shops
So, wear all 5 pieces. Trophy!
Try to wield a Legendary
melee weapon at the same time to earn this also