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