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