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