how long will it take? i wait almost 30 mins.

Rival's Remourse how do I unlock it? Is it local coop (which I did) or is it time trial and leaderboard? Furthermore, what are "stages"? I get achievements for route breakers for paths I have already driven. The naming doesn't make any sense to me as again I have no clue what stages mean Edit: I just got 3 achievements for a route (stage 8,9 and 10) while driving the same map. I literally have no idea what that even means in regard to a track...