Petit Ver143,863 Locked 24 Sep 2011 27 Sep 2011
Easiest way to do it :
1/ create another account on your Xbox, even a silver one will do the trick
2/ launch Burnout Crash! and link your new account to an EA account (should take roughly 1 minute)
3/ select Autolog Challenges (Edit: according to minusT45, it doesn't work with Autolog Recommends) and challenge your main account, the one you want the achievement with
4/ now launch the first intersection and quickly let five vehicules escape so your score shouldn't be very high. The challenge will be sent to the other account via Autolog
5/ bring up the xbox guide and sign out without leaving the game, then sign up your main account
6/ the game will notify that you've been challenged, so go to Autolog challenge and select the said challenge
7/ beat your other account's score
8/ sign out your main account and sign up the other account
9/ repeat steps 3 to 8 two times.
Done.