Image[i.imgur.com]
Aerial view of the entire map, marked with the "paths" you should follow in order to complete the map.

(Please refer to the image. If you are a color-blinded, consult to your nearest friend to explain the image.)

(1) You will spawn in the dark blue circle area. Follow the dark blue path until you reach in a small room; activate the computer (btw, every single buttons in this map are marked with the red glows, you will easily identify them.) to unlock green path.

(2) Follow the green path stemming from the dark blue path. You will notice it actually is a folked road; which direction you go first doesn't matter, but I'd recommend going the right part first. Here, you will unlock the red path (press the button at the end of the path). Now return and go to the left part. You will obtain a keycard that will also unlock red path.

(3) Follow the red path stemming from the green path. At the end of the path, you will need to use the keycard you collected in the green path. Obtain the white key placed on the shelves.

(4) Follow the purple path stemming from the red path. Use the white key you collected in the red path. Use the flashlight as the entire area is dark. Press all the buttons at the end of the path to unlock orange and yellow path.

(5) Follow the yellow path stemming from the red path. You will obtain a bomb that will unlock orange path. Keep follow the path and you will eventually reach the green path you followed before.

(6) Follow the orange path stemming from the red path. Use the bomb you obtained before to destroy the obstacle. To open the vault door, you need to activate two-person button. There is a way to open it solo, however, I will keep it secret for now. Anyway, you will obtain the device here. This will unlock light blue path.

(7) Follow the light blue path stemming from the red path. You need to bring the device, destroy all the striders and the chopper to unlock the ending.

There might be something I missed though. I will keep update the page if necessary.

Also, there should be an update (both overhaul and general updates to the map) soon.