If your having trouble with the elevate your sences achievement, than what you need to do is you have to get the PTRS-41 and upgrade it in the pack-a-punch machine. (i recommend doing this as soon as you can) then when you start, if you are looking to the fence in the center of the mainframe, go to the left threw the door and look out the fence that is directly left. look out with your PTRS-41 upgraded for a box thats out of the map thats out in the distance with a red button on it and shoot it. If you did it right than you should have gotten the achievement and see perks like max ammo, the bomb 2x points etc. flying in the air. Remember that the PTRS i believe NEEDS to be upgraded, i havent tried it not but people told me it only works upgraded.