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