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