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