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