Either in Career or Grand Prix mode, choose "Long Race Weekend". Change the difficulty to easy too. There are 3 practice sessions, 3 qualifying sessions and obviously the race. You must set the fastest lap in each of the sessions and the race. You can check your competitors times whilst in your garage. You may also fast forward time (). If you have a time in practice that you don't think will be beaten, you may skip to the next session.
Be on top of the time sheet at the end of each practice/qualifying session and the race to be awarded this achievement.