Here is the full list of all 29 Slipstream achievements. It takes around 12-15 hours to unlock all of the achievements on Windows.
Win a battle royale match.
Complete everything.
Win a cannonball race of 15 tracks.
Win a cannonball race of all 5 secret tracks, in any order
Defeat all the rivals in a cannonball race of 5 or more tracks.
Win a cannonball race of all 5 nighttime tracks, in any order.
Win a cannonball race of 5 or more tracks.
Stay on the slipstream for more than 15 seconds in any mode.
Defeat Norman in Parthenon.
Defeat David in Neon City.
Defeat Alex in Metropolis.
Defeat Tofu Boy in Akagiyama.
Win all the races in all cups.
Win the Diamond Cup.
Win the Emerald Cup.
Win the Sapphire Cup.
Reach every exit defeating all the rivals along the way.
Win all the races in any cup.
Win the Ruby Cup.
Win a race in Grand Prix mode without any car upgrades.
Win a race with every car model in Quick Race Mode.
Complete all possible routes in Arcade Mode.
Defeat every rival character in Arcade Mode at least once.
Visit all the tracks in Arcade Mode.
Get to all the exits in Arcade Mode.
Defeat all the rivals in a single Arcade Mode run.
Defeat Camilla in Highgate Cemetery.
Complete a stage in arcade mode without touching anything.
Get to the finish line in Arcade Mode.