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