Is there already a list or setting to show what locations on each route have had the route tasks completed? I can't keep track of every station/location that I've already done. If there isn't something already for this then is it something that can be added? I know many people don't really care about that stuff, but many people are also achievement crazy and need to complete everything.
No, there's no way of tracking which route tasks you have done and where they are within the game. The main screen for the route tells you how many of each item you have done but that's it. It would be nice if something could be done to track where you have already been but you'd still have to search if you've missed something at a location.