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