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