Now, once you're inside a Reaper Controlled system, start scanning around the planets using 'LT'. Don't worry, you'll be able to access more systems as your complete more missions. If you're just starting the Campaign, then you'll notice there are very few Reaper controlled systems that you can access at the moment. The Text and Video Guide both show you how to unlock the 'Lost and Found' & 'Untouchable' Achievement's in Mass Effect 3.įirst off, on the Normandy, go to your Galaxy map which is on the second level of the ship. *If you would prefer a Video Guide for this Achievement, then you can watch the video provided below, or choose to read a Text Guide.* Once you complete a mission, meaning, physically leave the ship, shoot some things, and get back on, they'll be gone when you return. If you DO find yourself in a race to the edge of the system, it is vital - absolutely vital - that you shout 'Meep meep!' as you escape.ĮDIT: Oh, and the Reapers stick around after you leave. You'll get a good head start, but if you're too far away from an escape point, they'll catch you every time. Some advice about escaping Reapers in general: you accelerate better than they do and can be more maneuverable, but they're faster. As soon as the Reapers appear, escape you can do this by either leaving the system or hopping onto the relay network. Simply park yourself next to a Reaper-free edge of the system (or near the mass relay) and spam your scanner (hopefully after finding everything in the system).

Those red arrows that appear at the edges of the system indicate incoming Reapers, and when the red bar maxes out, that's where they'll show up. As you scan (left trigger) an occupied system (red one with a Reaper on top of it), the Reaper awareness will go up.

Mass effect 3 scanner