Hey, congrats and welcome to the 100% club. Not that there's any actual "club" or anything. But, you know...
A couple things for anyone curious. You do NOT need all gold licenses to get 100%.
Many people miss this, but in SIM mode, you have to win every single race. Not just the series, but each race in them. If you don't have a gold trophy somewhere, just go back and win that race (no need for the whole series again)
And, yes, get first place in all time trials in arcade. You also have to win all the arcade races at an upper difficulty setting. (I can't remember which exactly, but the progress chart in arcade will have three levels for difficulties; they all have to be filled. But if you win a race at the upper level, it'll credit you; you won't have to do all the easy ones).