GHOST 1.0

In the main menu under Extra Modes you can find an option called "Mission Mode" This is the first mission available and basically has you find 20 drones within an area. Not too hard but do keep in mind that this has to be completed in one life!

Some tips
1.)The bonus objectives do not matter for this achievement so don't bother unless you're a extreme completionist!
2.)Try to minimize the damage that you take, there are only a few repair drops that occur later but at the very end you have to fight a boss (A biped mech)
3.)By the time you get to the boss, you can cheese it by dropping to the first platform and shooting it with your pistol, although this will take forever. I was able to take him down with just the drones that I found and blitzed my way to the left. There are alot of other enemies who drop in as well as you traverse the hallway however so be wary of where your shield drone is to minimize the damage you take.
4.)Take each encounter slowly if you're having issues surviving, as long as you can wittle down the enemies health, you'll be able to finish traversing the room