I would say the 50pp and 100pp trophies will be the hardest along with the .01 second victory trophy. Three of a Kind seems like one you'd get on accident. I mean, if you race long enough, you'll get that trophy.
But, yeah, pretty easy trophy list. I doubt I'll ever get the gold trophies but everything else should be pretty easy. BTW: if drag races exist, the .01 victory would be pretty easy with two identical cars. Also, the PP trophies don't specify that they have be in career mode, so, if one could set a PP settings in an easy AI race in arcade or possibly set it online and just take turns winning, those should be pretty easy, too.
EDIT: Actually if the licenses are just races, now, then getting all gold will be much easier for less skilled players. I suspect it will take about a week or so for someone to platinum this game. I'm gonna even try this time. (GT5 was insane. 600 hour platinum for it. GT6 seems like about 100 hours. If that.)