Waste Not 10G
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.