In "Season Challenge" mode, you will be able to select a rival from the main hub before you race, simply beat him in two races (out of three) to unlock this achievement. Aim to out-qualify the rival in the one-shot qualifying to maximise the chance of beating him in the race.
To make this easier, you can:
- Select a rival from a lower rated team (HRT, Caterham, Marussia)
- Select easy as the difficulty for the Season Challenge, giving you access to the top teams (Red Bull Racing, McLaren Mercedes, Ferrari)
Good luck!