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