If you take a look on your Burnout Paradise acheivment list you will see at the bottom two new ones for the party pack.
What acheivment would you have with the new DLC if you could make your own up ???
15G - Forum closer (Close any Burnout forum down)
25G - Toys outta pram (upset someone with power)
10G - Its my ball and i'm going home (never play paradise cause theres no speedo)
10G - Its just not cricket (get less then 100 hours of gameplay in paradise).
Feel free to make your own up, if you are ps3 you could make your own trohpies up.