Originally Posted by JohnnyR74
This is how I got this achievement not 5 minutes ago:
The Phantom Corsair is worth 24,000 and the Deusenberg Walker Coupe is worth 25,000. Just destroy both of these, finish the case and you'll have it. They're both hidden cars, so their locations will be on the map.
Then again, you could just destroy a bunch of hidden cars and unlock the achievement, but those two cars are the only ones with values posted on the Social Club Website.
I used the Corsair as well. Very fast and surprisingly tough. I kept destroying them over a period of 30 min or so and wound up with over $178K in damage.