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