Here is the full list of all 29 Slipstream achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Defeat David in Neon City.
Defeat Alex in Metropolis.
Defeat Camilla in Highgate Cemetery.
Defeat Tofu Boy in Akagiyama.
Complete everything.
Complete all possible routes in Arcade Mode.
Reach every exit defeating all the rivals along the way.
Defeat every rival character in Arcade Mode at least once.
Win a cannonball race of all 5 nighttime tracks, in any order.
Defeat Norman in Parthenon.
Win all the races in all cups.
Win a cannonball race of all 5 secret tracks, in any order
Win a race in Grand Prix mode without any car upgrades.
Defeat all the rivals in a cannonball race of 5 or more tracks.
Win a cannonball race of 15 tracks.
Win a race with every car model in Quick Race Mode.
Visit all the tracks in Arcade Mode.
Win the Diamond Cup.
Win the Emerald Cup.
Win all the races in any cup.
Win the Sapphire Cup.
Win a cannonball race of 5 or more tracks.
Stay on the slipstream for more than 15 seconds in any mode.
Win a battle royale match.
Win the Ruby Cup.
Get to all the exits in Arcade Mode.
Defeat all the rivals in a single Arcade Mode run.
Complete a stage in arcade mode without touching anything.
Get to the finish line in Arcade Mode.