Kane & Lynch 2: Dog Days

After I finished my playthough which I did in co-op with a friend I was at around 600 kills, After I just load up the chapter "Airstrike" and doing this it takes about 8 minutes to finish the level on easy I got about 54 kills every time I played the chapter may have missed a couple of kills here and their.
(Also when you get to the bit of the end with the second helicopter after it saves just press start and restart chapter)

Heres a video of the chapter I am speaking of:

Pretty much self explanitory, 1000 total kills. I finished the single player game (I guess it'll work in co-op too, but you have to share the kills so will take longer), but replayed a few chapters to mop up the chievos and it popped in that, so I assume that it DOESN'T have to be in one playthrough.

If you got noone to play co-op with, but have a second controller, I'd suggest you play the level "Airstrike" on easy with yourself. The second player doesn't need to do anything, and it's not harder than usual either, so why not get at least 10 points you'd not get otherwise?