Battlefield 3

This achievement is rather easy, but an explanation can always help.

At the beginning of Mission 7: Thunderun, you will take control of a turret on top of the tank. After some story elements, you will control the tank itself, and just proceed forward. After a minute or so, one of your teammates, will mention enemies tanks "on your 3" (right hand side), and they will become marked by orange diamonds. Make sure that you zoom in using RB, and begin to take aim. Now just go back and forth (LT then RT), and take shots at the enemy tanks, remember to lead your shots as they take some time to travel farther distances. Just eliminate the 6 tanks, and the achievement is yours. If you die, reload the checkpoint, and it will still work.

Please view for the video for an in-depth visual of this explanation:

this is done at the very first part of mission 7 Thunder run. just kill the first set of tanks before you go to the fort. this should come without trying but i made a video if you need help

On mission 7, Thunder Run, you'll be riding in a tank, and will eventually take control of it. To accelerate, press and hold . Turn your turret with . Fire with . makes the camera zoom in and out. You're zoomed in if your aiming reticule symbol is larger. Knowing this is important, as it lets you quickly figure out whether or not you're zoomed in. When you're zoomed out, you can see more of where you're tank is moving. Pressing triggers night vision. Pressing boosts your speed. Soon, you'll find 6 enemy tanks on your right side, as one of your teammates will announce. If you need it, use night vision, as it makes your targets easier to see. Aim at each of the targets and fire at them. Sometimes you need to aim ahead of them to account for their speed. Zoom in on them at a distance to hit them faster and more accurately. If you don't do this correctly, you can reload the checkpoint and try again.