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