For this achievement you need to park an Aston Martin DBS in front of a casino.
Create a Custom Match on the following:
City -
Las VegasRoute -
Long Strip StraightsThe other settings are optional but they do not matter.
Once in the lobby you
must select the
Aston Martin DBS (Class C)
Once the race has begun reverse down the track until you reach a casino on your right with the words 'Casino Royale' on the front, come to a full stop in front of the casino whilst looking right and the achievement is yours.
Here's the casino you're looking for
Here's a video demonstration.