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