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