How To Unlock: Discover 100 Locations.
In order to discover a location all you have to do is walk up to it so it flashes up with “Location discovered: [text]” on the screen… there are 300+ locations in all, so 100 is absolutely nothing. If the worst comes to the worst, pick a place on the map and walk to it, stopping at every location along the way. The more locations you discover, the less travelling and more fast-travelling you’ll be able to do in the future. Think of it that way.