yeah and tbh they're all achievable if you put the time in on a track. i'm far from a top driver, but I found passing them to be well within grasp after spending time on track during daily races, or hotlapping in different cars for a while, usually watchign some youtube videos too, as sometimes you can run higher gears in/out of turns versus those suggested by the game, or different lines, braking points etc.
if you';re not a top driver and hoping to turn up and cruise through/strike gold within a few goes, think again... probably as I did when first started playing this game. you really need to know the track and drive a flawless, rapid lap to do so. but at same time, its far from impossible.