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.
Win a cannonball race of 15 tracks.
Stay on the slipstream for more than 15 seconds in any mode.
Defeat Norman in Parthenon.
Defeat David in Neon City.
Defeat Alex in Metropolis.
Win a cannonball race of all 5 nighttime tracks, in any order.
Defeat Tofu Boy in Akagiyama.
Win a race in Grand Prix mode without any car upgrades.
Win a battle royale match.
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.
Defeat Camilla in Highgate Cemetery.
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.
Defeat all the rivals in a cannonball race of 5 or more tracks.
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 cannonball race of 5 or more tracks.
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.
Defeat all the rivals in a single Arcade Mode run.