Trackmania Turbo

From the Trackbuilder screen, select "Create Your Own Tracks," and before selecting an environment to build the track in, scroll down to "Random Generator." You can modify the desired length of the track so that it doesn't build something incredibly lengthy for you to test drive. Once the track has been built by the game, simply press to validate the track. When you're finished the test drive, pressing will save the track and pop the achievement.