Happy time Achievement
Win a race in split screenTo unlock this achievement, you'll need at least one extra controller (two total). Choose 'Play With Friends' from the main menu, and you'll need your second controller to sign in with at least a guest account. The shortest track is the final Overdrive Event from Adventure Mode, and you can set it to one lap to make it even shorter. Choose any racer you want. Note that you will also have a few AI opponents in split screen. You simply need to finish in the top three to unlock this achievement, which should be very easy to do on Easy.