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