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