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