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 Norman in Parthenon.
Defeat Alex in Metropolis.
Defeat Tofu Boy in Akagiyama.
Complete everything.
Win all the races in all cups.
Win a cannonball race of all 5 nighttime tracks, in any order.
Win a cannonball race of all 5 secret tracks, in any order
Win a race with every car model in Quick Race Mode.
Stay on the slipstream for more than 15 seconds in any mode.
Reach every exit defeating all the rivals along the way.
Defeat David in Neon City.
Complete all possible routes in Arcade Mode.
Defeat every rival character in Arcade Mode at least once.
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 the Diamond Cup.
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 a battle royale match.
Win the Emerald Cup.
Win all the races in any cup.
Win the Sapphire Cup.
Win a cannonball race of 15 tracks.
Win a cannonball race of 5 or more tracks.
Win the Ruby Cup.
Get to the finish line in Arcade Mode.
Defeat Camilla in Highgate Cemetery.