Just found this from the5krunner 's site. The goal is to try and ride all the roads of the world. But within that, you get bonuses for ticking off percentages of all cyclable roads in a given area.
Shows how little variety in my riding I really do! Free is limited to backwards uploading only your last 50 rides, but that pretty much covers all of 2020 given how much time I spent on zwift indoors. Maybe a handful of rides from early Jan are missing.