Here is the full list of all 19 Roundabout trophies - there are 18 bronze and 1 silver.
Get a better eSports Speedrun Time than the No Goblin team.
Collect every Cash Stash.
Purchase every hat and paint job.
Discover all of the horns.
Aggressively warn a dozen pedestrians with the Trafffic Coner.
Purchase every property.
Collect every star in every ride.
Stand still for a minute of silence at The Memorial.
Purchase a pet eagle.
Reach a 35x multiplier.
Honk your horn 500 times, then honk your horn 500 more.
Drive into the sunset.
Make a huge mistake.
Follow a lady into the big smoke.
View the "How's Your Driving" screen outside of the tutorial. Useful, isn't it?
Accomplish every Sick Jump.
Reach 100% completion for the entire game.
Complete an eSports Speedrun without exploding.
Drive the entire "classic" length of Desert Limo without crashing.