Here is the full list of all 30 Apotheon achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Access the Agora Armoury.
Find all lockboxes on Olympus.
Beat game on Olympian Difficulty
Acquire the powers from all twelve Olympian Gods.
Acquire the Thunderbolt of Zeus
Find all rare weapons on Olympus.
Aquire the Cestus of Aphrodite.
Access the Gold Mine in the Sea.
Root out the assassins in the Acropolis.
Aquire the Sandals of Hermes.
Aquire the Artifice of Hephaestus.
Access Kleio's gift in the Acropolis.
Access the Assassin Stash in the Swamps.
Access Apollo's nectar cellar.
Access the Symposium of the Sun in Apollo's hall.
Access the Hunter's Trove in the Forest.
Access the Refugee stash in the Forest.
Access the Secret Grove at the Shrine of the Nymphs.
Access the Agora Market Scroll-keeper’s Office.
Access the Merchant Stockpile in the Acropolis.
Acquire the Aegis of Athena
Acquire the Crest of Ares
Acquire the Trident of Poseidon
Access the sunken wreck of the Euphemia in the Sea.
Acquire the Lyre of Apollo
Acquire the Sheaf of Demeter
Meet the Necromancer in Hades.
Acquire the Bow of Artemis
Aquire the Kantharos of Dionysus.
Ascend to Mount Olympus