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