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.
Access the sunken wreck of the Euphemia in the Sea.
Meet the Necromancer in Hades.
Aquire the Sandals of Hermes.
Access the Refugee stash in the Forest.
Access the Gold Mine in the Sea.
Root out the assassins in the Acropolis.
Access the Agora Armoury.
Access the Secret Grove at the Shrine of the Nymphs.
Aquire the Artifice of Hephaestus.
Access the Agora Market Scroll-keeper’s Office.
Access the Symposium of the Sun in Apollo's hall.
Access Apollo's nectar cellar.
Aquire the Kantharos of Dionysus.
Aquire the Cestus of Aphrodite.
Access the Hunter's Trove in the Forest.
Access the Assassin Stash in the Swamps.
Acquire the Aegis of Athena
Acquire the Trident of Poseidon
Access the Merchant Stockpile in the Acropolis.
Acquire the Crest of Ares
Access Kleio's gift in the Acropolis.
Acquire the Lyre of Apollo
Acquire the Bow of Artemis
Acquire the Sheaf of Demeter
Ascend to Mount Olympus