Full list of all 40 Roundabout achievements worth 1,000 gamerscore. It takes around 25-30 hours to unlock all of the achievements on Xbox One.
Made a huge mistake
Purchased a pet eagle
Unlocked the Inflatiboat For Cars
In "Run Like Crazy", got 150 yards away
In "Death from Above", survived for 30 seconds
In "Ball Bouncers", bounced the ball at least 12 times
Followed a lady into the big smoke
Unlocked the Traffic Coner
Unlocked the Reverser Wheel
Honked your horn 500 times, then honked your horn 500 more
Purchased some property
Purchased something from The Chrome Dome
Collected every star in a single ride
Viewed the "How's Your Driving" screen outside of the DMV ride. Useful, isn't it?
Unlock the Pickup Finder
Unlock the Multiplier Freezer
Unlock the Beary Nice Music Box
Hidden
Survive the Mountain Fair Demolition Derby without exploding
Stand still for a minute of silence at The Memorial
Die 360 times
Revolve over 53,596 times
Aggressively warn a dozen pedestrians with the Traffic Coner
Complete your first eSports Speedrun Challenge
Get a better eSports Speedrun Time than the No Goblin team
In "Limocide", take out 50 pedestrians
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
Reach a 35x multiplier
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 on a mission
Reach 100% completion for the entire game
Complete an eSports Speedrun without exploding
Drive the entire "classic" length of Desert Limo without crashing