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