Since the achievement is pretty straight forward only one tip of mine to save some time:
All of the events contain 6 races, 4 of them to qualify for the semi-final. You only need to win two of them, then you can retire after the beginning of the other two ones, the points will definitely be enough to qualify (normally around place 3-8).
But don't forget to drive all of the four qualification-races in one event to get the "First on the GRID" achievement.