You made it through an entire hostile area without so much as a squeak.
This can be done on the very first mission you do - Sarif Manufacturing Plant. You'll first want to takedown the guard that is around the corner ('First Takedown' achievement will unlock here). Once you've dealt with him, keep to the right and you'll see a forklift truck holding a box.
From here, pick the box up with and move it in front of the other piled up boxes next to you on your left. Now jump up onto the containers and follow the path until you come to the electrified floor. Look to the right of it and move the small box to reveal a gap you can pass through.
Crouch and pass through it to the other side. On the mainframe opposite you, there's a switch, interact with it and the electricity will turn off. Now just carry on around the corner and over the roof top until you come to an air vent. Open it up, and again crouch and walk through. As you pass through this vent you'll be contacted by Pritchard and the achievement will unlock.
Simple if you have invisibility, avoid 2 or 3 cameras, then hack the red censor thing go through it, avoid any people by hiding or using invisible, if done right you will get it on the elevator going up
I got this on the very first mission after being augmented(meaning with no extra auga like invisibility... on easy). Stick to the roof, knock out the first guard in the alley and stash his body around the corner. Stay to the right by the forklift, pick up the box that's on the forklift and use it to jump onto the containers when the other guards in the courtyard aren't looking. When you get to the top, move a box to open up a crawl space behind the generator. Flip the switch to turn off the electricity. Around the last generator is a ladder down to an office. I think that's when I got the achievement to pop. If not, message back here and I'll try to retrace my steps from there. But I do remember a little pop-up message from the tech guy with him being surprised that I got in undetected
I like running around like a armed headless chicken too much....
I got it at Hengsha Court Gardens when investigating the hackers apartment (some of the sticky notes are funny as hell), there's only 5-6 guards, easy patrol routes, and the seperate frequently around blind corners.
I've tried this several times on the first mission where you are augmented and I make it through without making any sound or alarming any gaurds. I make it to the roof and go through the vent and nothing pops up and I have tried multiple different ways of seeing whats wrong and the achievement does not pop up. My notifications are turned on so it's not that kind of issue...Does anybody else have this problem? Or can somebody help me out here? Thanks
I'd reccommend just going through the front door and knocking out the people in front, its easy if you watch the patrols, and drag bodies behind cover. Thats how I got it, surprising that taking the roof route didnt pop it out for you.