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.
Complete your first eSports Speedrun Challenge.
Collect every Cash Stash.
Accomplish every Sick Jump.
Discover all of the horns.
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.
In "Farming Simulator 1977", complete your farming in under 40 seconds.
Purchase every property.
Honk your horn 500 times, then honk your horn 500 more.
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.
Unlocked the Pickup Finder.
In "Death from Above", survive for 30 seconds.
Die 360 times.
Purchase every hat and paint job.
Follow a lady into the big smoke.
In "Limocide", take out 50 pedestrians.
Unlocked the Beary Nice Music Box.
In "The Great Hunt", find 6 regions.
Unlocked the Multiplier Freezer.
Purchase a pet eagle.
Purchase something from The Chrome Dome.
Aggressively warn a dozen pedestrians with the Trafffic Coner.
Reach a 35x multiplier.
Unlocked the Reverser Wheel.
Unlocked the Traffic Coner.
Reach 100% completion on a mission.
In "Ball Bouncers", bounce the ball at least 12 times.
Purchase some property.
Collect every star in a single ride.
View the "How's Your Driving" screen outside of the DMV ride. Useful, isn't it?
Reach 100% completion for the entire game.
Complete an eSports Speedrun without exploding.
Drive the entire "classic" length of Desert Limo without crashing.