Here is the full list of all 30 Apotheon achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Ascend to Mount Olympus
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.
Root out the assassins in the Acropolis.
Access Apollo's nectar cellar.
Meet the Necromancer in Hades.
Aquire the Cestus of Aphrodite.
Aquire the Kantharos of Dionysus.
Aquire the Artifice of Hephaestus.
Aquire the Sandals of Hermes.
Access the sunken wreck of the Euphemia in the Sea.
Access the Hunter's Trove in the Forest.
Access the Refugee stash in the Forest.
Access the Agora Market Scroll-keeper’s Office.
Acquire the Trident of Poseidon
Access the Gold Mine in the Sea.
Access the Merchant Stockpile in the Acropolis.
Access the Secret Grove at the Shrine of the Nymphs.
Access the Assassin Stash in the Swamps.
Acquire the Aegis of Athena
Acquire the Crest of Ares
Access Kleio's gift in the Acropolis.
Acquire the Sheaf of Demeter
Access the Agora Armoury.
Acquire the Lyre of Apollo
Access the Symposium of the Sun in Apollo's hall.
Acquire the Bow of Artemis