"Equip a Legendary Armor
SET."
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)
500 Helix creditsSpartan Renegade Armor
Nemean Lion Pelt
Odysseus Armor
Celestial Suit
Athena's Blessing
Wild Boar Armor
Abstergo Suit
Shark Armor
750 Helix creditsPegasos Armor
Hades's Champion
Armor of Dionysos
Sphinx Mane
Mighty Herakles
Sacred Oracle
Helios
Armor + Mount + Weapon (Packs tab)
1000 Helix creditsSpartan Renegade Pack
Nemean Lion Pack
Odysseus Pack
Celestial Pack
Athena Pack
Wild Boar Pack
Abstergo Pack
Shark Pack
1500 Helix creditsPegasos Mythical Pack
Underworld Mythical Pack
Dionysos Pack
Sphinx Pack
Herakles Pack
Oracle Pack
Helios Pack
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 achievement.
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 ***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)
Pirate (Gods of the Aegean Sea cultist drops)
Immortal (Worshippers of the Bloodline cultist drops)
Achilles (Heroes of the Cult cultist drops for Alexios)
Amazon (Heroes of the Cult cultist drops for Kassandra) thanks ForbiddenJobu
Pilgrim (sacred temple legendary chests)
Greek Heroes (Mercenary drops)
Arena Fighter (Arena contender drops)
Artemis (Daughters of Artemis animal hunt rewards)
Demigod (finish the story: defeat all cultists, confront Deimos)
Abomination (Hard Mode Mythical Creature drops)
Legacy of the First Blade DLC
Persian Elite (Order of Hunters cultist drops) Episode 1 Hunted
Master Assassin (Order of Dominion cultist drops) Episode 3 Bloodline
Fate of Atlantis DLC
First Civilization (various quests) Episode 1 Fields of Elysium
Fallen (Fallen drops + Arms of Atonement quest) Episode 2 Torment of Hades
(Crown of Hades is not part of a legendary set)
Dikastes (Atlantean Polemarch drops) Episode 3 Judgment of Atlantis
Pegasos (store)
Spartan Renegade (store)
Nemean Lion (store)
Hades (store)
Odysseus (store)
Celestial Suit (store)
Dionysos (store)
Athena (store)
Wild Boar (store)
Shark (store)
Sphinx Mane (store)
Abstergo Elite (store)
Mighty Herakles (store)
Sacred Oracle (store)
Helios Radiant (store)
store = Menu store, not in-game blacksmith shops
So, wear all 5 pieces (of the same set!). Achievement!
Try to wield a Legendary
melee weapon at the same time to earn this also