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