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