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