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