A quick-ish way to get this trophy, and contribute more to the cash grind, is to create a custom championship using the user-created track of your choice.
Doing a custom championship cuts down a lot of loading time between races and saves you from having to select the track each time.
Firstly, find a good track you would be willing to race on 29 more times and mark it as your favourite.
After adding it to your favourites:
- Start a custom championship
- Find the track by scrolling through the options (
) until you find it.
- Add it at least 4 times and then complete the championship as normal.
- Repeat until you get the trophy.