Posted on 20 October 19 at 13:17
There is at least one Sub location I can think of Off the top of my head, in The Hearthsong map, that you need a key for, that you only get by accepting a quest.
I just got explorer, I’m not sure how it’s tracked, because I’m in the white march 2 dlc and I got the achievement, that specially says, “excluding white march”. lol It may be x/151 maps visited or whatever tracking.