UPDATE: I am no longer able to offer help with this achievement ever since going Legend (prestige) which has reset my rank. I did so to unlock an avatar award item. Anyway... I just haven't gotten very many requests for such an old game that isn't backward compatible.
However, do note that it is still possible to unlock this achievement. The solution is at the bottom.
Other viral achievements that I can help with (Xbox 360 console required; Not backward compatible):
Other viral achievements that I can help with (Xbox 360; backward compatible on Xbox One):
The The Mingler achievement in Soltrio Solitaire worth 0 pointsPlay with another player with "The Mingler", or be one of the first 500 to be ranked online.
Other viral achievements that I can help with (Xbox One / Windows PC):
Note: This achievement is not obtainable in private match
To unlock this achievement, find another player that has reached rank 50 (including players who are Legend rank 50), invite them to any of the Blur Events (Race or Motor Mash), and beat them
If you plan to go for this achievement in a race, you don't need to finish in 1st place (or even cross the finish line for that matter). All you need to do is be ahead of the rank 50 player (e.g. you in position 18 of 20 with the rank 50 player in position 19 of 20) at the time the race ends, which results in both players having a placement of "DNF" (Did Not Finish). The achievement unlocks on the results screen.
Motor Mash events:
This can also be done in Motor Mash. All you need to do is to have more points than the rank 50 player by wrecking other vehicles during the match before the match ends. You don't need to have the most points to get in 1st place, just enough to beat the rank 50 player. The achievement unlocks on the results screen.
Also... due to a bug in the game, it is possible to invite high-rank or low-rank players into playlists that they wouldn't normally have access to (i.e. the Driving School playlist, which is hidden from the selection after reaching rank 11). Consider this when boosting for other achievements.