I have no idea what I'm doing wrong here, I've spent several hours looking everywhere to work out which area I've uncovered.
I've visited the small island below Sammos. I've visited Chytra Atoll below Kythera Island. I've visited all of the Obsidian Islands multiple times. I've been to the Valley of the Two Kings.
Nothing is unlocking! It'd be easily solved if the game gave us a Percentage Breakdown of what we've unveiled and what we haven't.
Ubisoft Support were helping me on Twitter but when it was obvious they had no idea what was going on they quickly stopped replying.
For anyone stuck on 99.53% there is a region that was defogged by myself earlier in the game, but l still was stuck at 99.53%, then later on today l was sent to the valley of nymph in the region of PHOKIS, IT WAS HERE ON THE SYNC POINT that finally pooped the trophy for me or whether there was a delay in it unlocking i'm not sure, but that seemed the region that unlocked it for me.
FOLLOW ME ON YOUTUBE FOR MORE ASSASSIN'S CREED ODYSSEY VIDEOS
PSN DANNYBOY1973
Well, it glitched for me as well. I've been to every possible sub-region and island (including the small ones, of course) and no trophy popped. I guess I won't be buying any other AC games on the release date, only after a few months when this sort of stuff has been fixed...
Edit: Well, I revisited some places and it finally popped. I hope the rest of the trophies aren't so troublesome. I've now realised that the Club says that I've killed 11 cultists and actually it's 12 with Elpenor.