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