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