Not a perfect run I took a safer route (I went to the observatory and to the dogs first) and have my own safer strategy for observatory. I show my weapons at the end of the video. :D
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https://www.youtube.com/watch?v=weS08EMP5JY
The goal of this Trophy/Achievement is to do not get hit until you get to the plane. Just try to stay in the bottom right section of the screen, and you'll get it EZ. Maybe it'll be few tries, it's a bit rng. I did it on hard. Oh, and do it solo of course. :D
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https://www.youtube.com/watch?v=_rtWCqrJSD0