Putting on the Ritz
Well for this one you have to become a criminal expert... much easier than you think.
You just play a few rounds , if it's your first time on multiplayer then this can be achieved in one round :)
The main thing you want to do is escape, but here's the catch you can't kill anyone, AI players, human players fluffy pink leprechauns .. KILL NO ONE !!!!
You don't have to get out with much cash i got out with $80,000 but i escaped at the end of the round when it shows you the scoreboard achievement will unlock.
If you have played a few matches already just play a few rounds withut killing anyone and get a bit money :)
My achievement unlocked 23/10/2010 but TA is going through server changes so has yet to show, check xbox profile if in doubt.