Doritos Crash Course 2

This is quite self explanatory. Go to single player > world tour and select a level with a small red trophy icon to the left of its name. Just play through and finish the level without dying.

You 'die' if you fall off the map into the water for example. Anything that resets you at the checkpoint counts as dying.

I recommend playing the first level, as it is the easiest. If you're having trouble, don't worry about time- it doesn't matter how long you take.

You'll probably pick this up the first time you boot up the game.