To get this achievement you will have to play 25 championships. Each championship has 4 races, except for the first which has only 3. Therefore, you will need to play 99 races to get this achievement. Since each race is around 2-3 minutes, his will take you anywhere between 3-4 hours to complete, not including driving to each event and the festival after every 3 championships. Because of this I would recommend getting the perk which allows you to fast travel anywhere