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