The galaxy map is located on the Normandy and is required for space travel. While in this view, you have the ability to fire a sensor pulse (see "Lost and Found") which detects War Assets for you. Reapers (an alien enemy) have a chance to pick up on this signal. You will notice a "Reaper Alertness" bar on the bottom left of your screen. After it gets full Reaper vessels will fly after you. They are faster and it will be game over if they get on you.
The achievement requires you to get the alertness up full, and then go through the Mass Relay to escape. The best thing to do is save before trying. Get your alertness up and escape. Afterwards, just reload. An extremely easy way is to follow the route in the video which is extremely short. You can get this achievement in a minute or two.
For anyone wondering how to do it, its easy. Just go to a system and go around scanning until you alert the reapers. Book it to the Mass Effect Transporter (not sure if thats the name, but you know what I mean) and just cland just get out of there.
I did this one super easy C: Just scan until your reaper alertness bar is almost full and fly over to one of the system exits, scan once more and when they start attacking fly out of the system. They can't follow you out of it.
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