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