I created a checklist to track my progress, shared on Google Docs here:
Google Docs - Forza TracksIt should prove useful if, like me, you want to work towards this achievement while at the same time using a hired driver to grind out the majority of the event list for the Bucket List achievement.
If you know you are missing certain tracks the checklist lists what events you can find those tracks in on the event list so you can hunt down your missing tracks in the event list and kill two birds with one stone.
Just download a copy and mark off the tracks as you complete them, safe in the knowledge that you can send out a hired driver to do the dirty work if you've raced the track already.