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