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