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