No missable achievements (plus 30 unknown)
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Ascend to Mount Olympus
Acquire the Bow of Artemis
Acquire the Lyre of Apollo
Acquire the Sheaf of Demeter
Acquire the Trident of Poseidon
Acquire the Crest of Ares
Acquire the Aegis of Athena
Access the Agora Market Scroll-keeper’s Office.
Acquire the Thunderbolt of Zeus
Access the Secret Grove at the Shrine of the Nymphs.
Access the Agora Armoury.
Access Kleio's gift in the Acropolis.
Access the Assassin Stash in the Swamps.
Aquire the Artifice of Hephaestus.
Aquire the Kantharos of Dionysus.
Meet the Necromancer in Hades.
Access the Symposium of the Sun in Apollo's hall.
Access the Merchant Stockpile in the Acropolis.
Aquire the Cestus of Aphrodite.
Access the Gold Mine in the Sea.
Aquire the Sandals of Hermes.
Access Apollo's nectar cellar.
Access the Hunter's Trove in the Forest.
Access the Refugee stash in the Forest.
Root out the assassins in the Acropolis.
Acquire the powers from all twelve Olympian Gods.
Find all rare weapons on Olympus.
Access the sunken wreck of the Euphemia in the Sea.
Find all lockboxes on Olympus.
Beat game on Olympian Difficulty