One of the easier achievements...
You can get 2 achievements if you take the BMW for a drive. Let me explain.
Just start up a race in the performance series ( carson ridge reservoir 2nd race for example) or press "Y" on any dot (race event) on the map to free drive and select the BMW M3 E92 as car, if you choose free drive it's listed under the Performance Series. While in the race press start and select Photo mode, press "A" to take a snapshot...
After that you'll have to go back into the menu ( not the seacrest map ) and goto photos ( far left ), press "Y" and enter any text, press done. you can recognize a dreamshot because you'll see "HD" under them.
Note: You can get this achievement earlier in the game if you use the BMW Z4, thanks to
morcre for pointing that out.
That's it, 2 achievements unlocked. The second one being