DiRT

This can be achieved on any difficulty setting. This series has 3 events with 5 to 7 races each where you use the same car the entire series. Be sure to pick a car your comfortable with. Be sure to repair at each opportunity. Repair opportunities only appear between races 2 and 3 and races 4 and 5 of each event but your car is fully repaired between events. (Should be noted if your doing "long", you also get to repair between race 5 and 6 of each event)

I just noticed that if you do each event at once, you won't get the cheevo. You really need to select the European rally instead of Germany, UK & the other one (forgot the country) apart. I dont think length does matter (:
Just so you know (same thing for international & world wide I think)