Play through the "Vendetta" mission until you get to the part where you first assault the Nazis (directly after you are blown out of the building, then climb up a ladder with Sgt. Reznov to fight). This is the part where he talks about blowing up the flamethrower's fuel-packs to take out multiple enemies. Start killing enemies, making sure to take out the machine gunner in the far building, as he can throw off your aim. During the fight, four enemies will come out on a balcony to the left, at about the same height you are at. The closest enemy will be too far away from the others to get a group kill, and will actively target you; kill him. Wait until the remaining three enemies all stand and line up, then shoot through all three of them. They usually do not target you, as they are concentrated on the fight.
Play through the "Vendetta" mission. After you shoot General Amsel's guards and move up to the car with the sergeant, a group of Nazis will appear down the street. Do not follow the sergeant. Instead, stay near the car, and wait for three of the Nazis to get in a line, then shoot.
