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