Assassin's Creed Odyssey (Ultimate Edition) 100% Walkthrough Part 1 / So It Begins

I don't know whether there actually is any official 100% checklist for this game, by doing everything (story/side quests, locations to be completed, synchronization points etc.) I have 100% completion awarded on Uplay. Enjoy the most massive walkthrough of mine so far! As the DLC The Fate of Atlantis is entirely released, this walkthrough became 540 parts long!! Also in this video: Quests / Debt Collector & Merciful Gods Locations completed / Cave of Tethys (Not sure though whether I need to later complete it again, as right after the cave those assholes attacked me first time, I died), Ktimene Beach, Melissani Cave & Drogarati Cave