Here is the full list of all 40 Roundabout achievements.
Revolve over 53,596 times.
Reach 100% completion for the entire game.
Complete an eSports Speedrun without exploding.
In "Limocide", take out 50 pedestrians.
Drive the entire "classic" length of Desert Limo without crashing.
Collect every star in every ride.
Survive the Mountain Fair Demolition Derby without exploding.
Purchase every hat and paint job.
In "The Great Hunt", find 6 regions.
In "Destruction Derby", take out 8 cars.
In "Farming Simulator 1977", complete your farming in under 40 seconds.
Get a better eSports Speedrun Time than the No Goblin team.
Complete your first eSports Speedrun Challenge.
Discover all of the horns.
Unlocked the Multiplier Freezer.
Collect every Cash Stash.
Accomplish every Sick Jump.
Stand still for a minute of silence at The Memorial.
Purchase every property.
In "Death from Above", survive for 30 seconds.
In "Ball Bouncers", bounce the ball at least 12 times.
Honk your horn 500 times, then honk your horn 500 more.
Drove straight for Beth.
Aggressively warn a dozen pedestrians with the Trafffic Coner.
Make a huge mistake.
Unlocked the Pickup Finder.
Unlocked the Beary Nice Music Box.
Unlocked the Inflatiboat For Cars.
Die 360 times.
In "Run Like Crazy", get 150 yards away.
Purchase a pet eagle.
Unlocked the Traffic Coner.
Reach 100% completion on a mission.
Follow a lady into the big smoke.
Unlocked the Reverser Wheel.
Reach a 35x multiplier.
Purchase some property.
Purchase something from The Chrome Dome.
View the "How's Your Driving" screen outside of the DMV ride. Useful, isn't it?
Collect every star in a single ride.