Quite easy and simple to achieve - unless you are good enough at the game to complete this properly and able to race competitvely against the AI, it will be a bit of a bore and grind;
Simply load up Pro Career and get to the race - wether you skip the practise sessions and the quali or actually complete them, makes no difference. Once you get to the race, you have to complete the full 100% race distance. You can not DNF (crash out) or retire from the race - both of these will not unlock the achievement. Sadly, the full race has to be completed. If like me and you can not race competitvely, simply stay on track and allow all AI drivers to overtake you and lap you until the race leader has completed the full race distance. Try stay out of the way of the AI best you can as sometimes they will crash into you and rip off a wheel, DNFing you.