Upgrade the Adrestia to Legendary Status.

Complete all underwater location objectives.

Complete 20 Quests on Pephka, Obsidian and Abantis islands.

Complete the Hippokrates questline.

Complete 20 Bounties, War Contracts, or Naval Quests from Message Boards.

Complete Xenia's questline.

Recover the Cyclops's eye from a goat on Kephallonia.

Defeat Medusa.

Upgrade your Spear to Tier 6.

Defeat the Minotaur.

Complete The Daughters of Lalaia.

Fully crew the Adrestia with Legendary Lieutenants.