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