Unable to get the 80point achievement for getting gold trophies in Forza 3

I just started playing Forza 3, I noticed playing on normal you can always win the race no matter what. At first I played on hard for the first 3 races and I got 3rd-2nd place in most of them. I did go back to the event selector and I played them again and got gold trophies but will that even count toward that achievement? In season play you can't go back, the only way you can go back to do those races again is if you go to event selector, so is it okay if you place 3rd or 4th in season race but go back and do those races again in event selector getting gold trophies? Would you still get the achievment when your done the game?

get first all the time, go to event list because season doesnt make you race all of the races, just some. event list has every race in the game

So then it is okay if you don't win every time in season but go back to event list and play those same races getting 1st? you will still get the ACHIEVMENTi nt he end?