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