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