If you are disappointed with this game like me and don't wanna play all levels again I've found a solution to save time.
Set up the first special stage then start, when the race starts press
then "give up" from the race, when you are back to the special stage selections set up the second race and do the same give up process, keep doing this all over the 13 countries in every one of the 5 races that there is in each country, once done you get the achievement and save a lot of time.
The explanation of this is that everytime you give up the game set a time for you, the last time but count as completing the stage!
If you found some problem let me know..