Forza Motorsport

Simple enough description, Hold an S safety rating for 10 'Featured' events in a ROW. That includes not causing a penalty by colliding with players/barriers, going off-track, or cutting corners. Can be tricky given the known trolling of FM, but if you're willing to lose some skill rating points, id recommend trying to hold back in last place and take it easy as to not try to compete with players and potentially get side-swiped, brake checked, or rear-ended. By holding distance in last place, you not only certify a MOSTLY safe race, but you can go at your own pace and assure not to cause any penalties.

EDIT: do not participate in practice or qualification, by doing so you keep yourself off the track to not get rammed, as well as instantly getting last few pos so you dont need to worry from someone hitting you from behind. After achieving 5 S ratings, the next one may NOT register, current bug but after completing a 7th race, it will then reward you the 2 missing s ratings. This happened to both me and anxious man.

I've to admit for sure that achievo was a real pain to understand but i did suceed to get it at the end of 4 hours of the right patience... Here what are my tips to get it :

Choose the qualifier series races, the one introduction series who has only 12 players max per race which less annoying chance to be hitted by someone than on tha 24-player races.
After you select on the aviliable race, do litterally nothing (no training laps, no qualifications), just await the start of the race.
On that step: there some tips i advice you strongly to see :
First, make sure from the grid position, to be near the 12th position (worst place of all) until the very start of the race !
Secondly, If not if that case, no sweat, there some alternatives ways i'm giving :
If you are lucky, the game can place you at the bottom of the grid by the time you enter in the race, which not too bad. Because, even if you start at the 9th position ie, you can still manage after the race start to move your car on the side of the track and let ppl behind you move away from you, then you can do the race on the last position.
Also there a case you can have ppl joining and left the grid for some reasons, allowing the game to move you up or down, based on when you joined the race.

When you are in the race, depending where you are on the grid, mid pole or at the very bottom of grid, you will probably need to start to drive on your side and lets players go, then if you are behind of all other opponents, you really have to stick on the last position, execept if your opponent drive super bad / DNF early or go to the pitt. Also, always have a eye on how they drive and always brake enough if needed

I know its a long walkthough and maybe unperfectly said, but take note its only count if you end the race under the last time of 2 minute to end your last lap after the first player cross the lane and your driver rank is = to "S".

PS : If the race doesnt start by bugging for any reason or if you quit from the xbox button, your progress isnt affected for that achievement.