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