Here is the full list of all 40 Roundabout achievements.
Survive the Mountain Fair Demolition Derby without exploding.
Purchase every property.
Accomplish every Sick Jump.
Collect every Cash Stash.
Stand still for a minute of silence at The Memorial.
Honk your horn 500 times, then honk your horn 500 more.
Aggressively warn a dozen pedestrians with the Trafffic Coner.
Unlocked the Multiplier Freezer.
In "Limocide", take out 50 pedestrians.
In "Farming Simulator 1977", complete your farming in under 40 seconds.
Unlocked the Beary Nice Music Box.
Complete your first eSports Speedrun Challenge.
Get a better eSports Speedrun Time than the No Goblin team.
In "The Great Hunt", find 6 regions.
In "Death from Above", survive for 30 seconds.
In "Destruction Derby", take out 8 cars.
In "Run Like Crazy", get 150 yards away.
In "Ball Bouncers", bounce the ball at least 12 times.
Die 360 times.
Drove straight for Beth.
Make a huge mistake.
Unlocked the Inflatiboat For Cars.
Unlocked the Pickup Finder.
Unlocked the Traffic Coner.
Unlocked the Reverser Wheel.
Purchase a pet eagle.
Purchase something from The Chrome Dome.
Follow a lady into the big smoke.
Reach a 35x multiplier.
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?
Revolve over 53,596 times.
Discover all of the horns.
Purchase every hat and paint job.
Collect every star in every ride.
Reach 100% completion for the entire game.
Complete an eSports Speedrun without exploding.
Drive the entire "classic" length of Desert Limo without crashing.