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