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