Every shot with the remote sniper kills a person or vehicle.
Mission 4: Struck Down
During this mission, you are asked to use the remote sniper multiple times. To be the achievement, you must make sure that you don't miss any shots. There will be a total of 4 remote sniper sections throughout the mission. Just make sure you are aiming a stationary enemies, and never shoot if you aren't confident. the first time you take control of the Remote Sniper is just before you breach the room to find Ajax. The second time you will be after you leave the building to take out some enemies with launchers. The third time you will be exiting the building with Ajax and the last time you will be escaping in a chopper.
Once the mission ends, the achievement will unlock.
Mission 4: Struck Down During this mission you will have to use the remote sniper 4 times. You cannot miss these opportunities, as it's required to progress in the mission. Only fire when your crosshairs turn yellow. It will be a guaranteed hit.
If you miss a shot, you can pause the game and restart the checkpoint at any time. Even if you restart, you will still earn the achievement in the end.
-There are 4 events that have you use the remote snipers. You have to make every bullet count with everyone of them. I recommend not trying to shoot any enemies on the move and be methodical about your shots.
Love all the "hey i found this guide" self promoting on the very very unsly.
I'm not finding this hard, but occasionally (this last checkpoint) i restart from last checkpoint 3-4 times because its not just me shooting and i cant tell if i take them out or someone else does just seconds before me. Starting to think i should just take 1-2 shots and hope that works and leave the rest for the team so its not a who shot first contest...