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