Here is the full list of all 30 Apotheon achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Access Kleio's gift in the Acropolis.
Access the Agora Armoury.
Access the Hunter's Trove in the Forest.
Access the sunken wreck of the Euphemia in the Sea.
Access the Gold Mine in the Sea.
Aquire the Sandals of Hermes.
Aquire the Artifice of Hephaestus.
Root out the assassins in the Acropolis.
Aquire the Cestus of Aphrodite.
Access Apollo's nectar cellar.
Access the Symposium of the Sun in Apollo's hall.
Aquire the Kantharos of Dionysus.
Acquire the Thunderbolt of Zeus
Acquire the Crest of Ares
Acquire the Aegis of Athena
Access the Assassin Stash in the Swamps.
Access the Refugee stash in the Forest.
Meet the Necromancer in Hades.
Access the Secret Grove at the Shrine of the Nymphs.
Access the Agora Market Scroll-keeper’s Office.
Acquire the Trident of Poseidon
Access the Merchant Stockpile in the Acropolis.
Acquire the Lyre of Apollo
Acquire the Bow of Artemis
Acquire the Sheaf of Demeter
Ascend to Mount Olympus
Find all lockboxes on Olympus.
Find all rare weapons on Olympus.
Acquire the powers from all twelve Olympian Gods.
Beat game on Olympian Difficulty