Come from last place on the last lap to win a race event in World Tour Mode

The easiest place I think to pull this off on is the Ocotillo Wells track. Not far from the starting line there is a shortcut where you may notice you'll temporarily lose positions but almost immediately regain your spot or better. Simply get to this area on the last lap and wait until you're in last place to proceed. By the time you're back in the pack you should be in at least the top seven, however, sometimes the other riders are too spread out and you won't be able to catch up to the first place rider before reaching the finish. It may take several attempts but just restart and try again if you don't succeed.

Note: It has been assumed by some that if you're too far along in the World Tour rankings then this will be much harder. Therefore: By deleting your save file and starting fresh it may take away some of the challenge from the other riders. I can neither confirm nor deny this until I try it for myself, but if this is the case then you should be able to easily obtain this achievement while going after the No Messing achievement.