every trophy can be obtained by doing 1 more of each thing or completing the specific race for each chapter.
No Event Left Behind and I'll Show Them! I'll Show Them All! will auto pop on loading screen (complete all events and unlock every throwdown), so beware with that!
Superstardom and Spare Some Change for Gas? pop together after you complete one more race, so choose an easy one (reach level 50 and drive for 1000 miles)
If someone worries about platinum print, these trophies will pop during the podium.