Once you climb the ladder and get into the kitchen let the woman who walks in be apprehended, dont shoot her. To get this trophy you will need to kill 11 people with 11 bullets. No need to aim for head shots body shots work just fine. You also cannot be shot or take any damage. The first room to the left has 3 targets shoot the 2 guys first then as the woman grabs the gun drop her. Your trophy is voided if you kill someone before they reach for a weapon. Move up to the 1st floor. Your teammate will take out 1 enemy to the left. Once that is over choose the door closer to the stairs face on. Roll the corner slow and as you see the hostage get ready to shoot the bad guy behind her. Once he is down wait for her to grab the gun then drop her. The last enemy on the floor is hiding in the corner closet open the door and hold an angle then drop him when he rushes you. Once you get to the second floor smash the door open on the left side of the door peak right and shoot the 1st guy. The second guy can be in 2 places so you have to be careful. He will either be holding an angle to the right when you enter the door or in the corner at your 1 oclock when entering the room. The last guy on this floor will bust open the door to the left. When you get to the next floor do not shoot the lady with a baby. Once you enter the next room quickly shoot the guy as he crawls under the bed. On the final floor wait till price tells you to shoot but dont wait too long because if price kills her it will not unlock.