Burnout CRASH!

Note that you must beat a "BEAT YOU" recommendation. This is different than a simple "Friend X is now in a better position". If you simply set a low score with your other account on your first try, you won't get a "Beat You" recommendation, just the other one, and won't be able to get the achievement.

Step by step method I used :

1. Set a low, but not abysmally low high score on a stage, say about 2-3 millions on an early stage. You'll have to play this far with your second account, so try to use an as early stage as possible. As for the mode, it is easier on Road Trip as waiting to lose 5 lives is the fastest way to end an event, but Rush Hour is easy too, albeit a bit longer as you'll have to wait 90 seconds (and you have to unlock it in the first place).

2. Log on your second account. Play a first time on the low score stage and score even lower. You can easily score really low by crashing into the first car you meet, then immediately perform a crash breaker to get it off the road, while getting you off the road aswell, using the stick. Then, wait for the event to end without any further crash and you'll likelly score under a million.

3. You can now set the "Beat You". Replay the same event, this time scoring above your main account's best. But not too high, try to get about 5 millions points, above the set score, but still easy to beat.

4. Now log back into your main account and check the Autolog Recommendations. You should find a "Friend X beat you on level Y", and that's the recommendation you want to take on. If there is still (unlikely) a "Friend X is now on position Z", repeat step 3 on your second account.

Now be sure to take on the challenge from the Autolog menu and feel free to trash your low score. You should unlock the achievement at the end of the event.