Go to Free Play mode and rent a fast car. In the "Race Setup", choose "Environments - Top Gear" and select the "West Circuit" track, which is the shortest. Set it to "1 Lap" and "1 Max Drivatars" on a nice day. Go to "Assists" and disable damage. Go to the "Drivatar Difficulty" and set the skill level to "Unbeatable". Then, start the race. When you reach the first corner on the track, hit your opponent's car from behind so it goes into the grass. Your car will also go into the grass, but your car will get reset back on the track, but the computer's car will not. You should now be able to easily win the race and get the "Super Human" achievement.