No, you didn't exactly answer it wrong...you just didn't point out the flaw in the question "do the stunts count towards 100% only when all of them are done?". Unlike rampages (for example), the percentage goes up for each UJ completed...although not always visually in the stats (since each "mission point", i.e. a given task that counts toward 100%, is worth less than 1% each). Rampages, on the other hand, awards it's solitary "mission point" only after the entire group of them has been completed. And just as with anything that adds to the percentage, you may or may not see the % stat change after completing something that awards a mission point. Kinda goofy that all those rampages add up to less than 1% game completion...but that is how it works. Total game percentage completed is calculated by how many mission points you have verses how many are in the game (153 or 154 for VC...I can't recall which at the moment).
This post has been edited by Nukey Shay on Tuesday, Oct 25 2011, 13:54