Complete any level and kill exactly 47 people in the process (this includes all targets, civillians, guards etc.. EVERYBODY) Start a game on "Curtains Down" go straight to the toilet next to the cloak room, and kill the guard. Now, stay in the toilet, picking off the guards one by one until every guard has come and you have killed them. Drag the bodies into piles of 5 for easy counting (this will be easy now as you have took out all the guards and no one will come and bother you while your in the process of doing it) Make a mental note of the number of guards (and anyone else if you killed some civillians in the cross fire) and go and kill the two targets. Add these 2 too the number of guards killed. Then walk around and pick off civilians until you hit the goldern 47 kills mark, and leave the level. This is easiest done on rookie or normal.