(43G) Back from the grave - Unlock Grave DiggerTo unlock the Grave Digger you will need 10000 points.
The quickest way I found to get this was by going into
skill driving and
urban and then completing the first event which gives you 1500 points for completing it under the time limit (I was averaging 14 seconds every time)...
Hit restart once at the finish screen and rinse and repeat this 7 times and you will have the required 10000+ points you need to unlock the Grave Digger as it banks the points after every event.
This method also works for the
Destroyer Maximus achievement
Hope this helps