Elite Sniper Trophy in Aliens vs. Predator
Kill 10 enemies with head shots from the scoped rifle
How to unlock Elite Sniper
This is easily earned at the beginning of level 3. Follow the objective marker up to the guy sniping off of the roof top. Here on the floor is the scoped rifle, quickly pick it up and look at the block to the left. An Alien will appear up here giving you the chance to get a quick headshot whilst he is still. Now after this complete your objective by interacting with the computer. As you head back down the stairs 2 more Aliens will appear, one directly across from you gives you another perfect opportunity to get a headshot as sometimes it stops still.
Simply kill yourself in this section and reload the checkpoint to give yourself another chance of getting kills, this took me about 5 minutes. Please note, if you have nothing to kill yourself with then there are some grenades located to the left of the far gate.
Another great opportunity for this is on level 6 (the last level). You will begin the level with a scoped rifle in your hands. As you go outside you will get to a bridge, an Alien invasion will now occur. They start off coming towards you from the far side of the bridge so just keep aiming for their heads and keep shooting. If you die it doesn’t matter because you will start right back before the invasion.