Aliens Colonial Marines

Aliens Colonial Marines

60 Achievements

1,250

35-40h

Xbox 360
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Micro Changes in Air Density

Micro Changes in Air Density

Track 100 hostile targets with the Motion Tracker

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How to unlock the Micro Changes in Air Density achievement in Aliens Colonial Marines - Definitive Guide

To get this achievement pull up your motion tracker with LB whenever the zeno's are around after you do this with 100 the achievement should pop

Thanks to comment below* you can also do this in multiplayer.
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12 Feb 2013 19:49

1 Comment
multplayer counts also, I unlocked it after playing a couple of matches.
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By wolfzero01 on 14 Feb 2013 18:52

This will come along your 1st playthrough on recruit. Remember to press  whenever you hear the "pinging" noise or when you see the "radar" prompt at the bottom of the screen. I had this unlocked before finishing mission 2.

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Pressing will bring up a motion sensor that tracks nearby movement, shown as white dots on the screen. This can be useful for determining enemy locations and gauging how close they are to you. If you make a conscious effort to always use your motion sensor in firefights, then it won't take long to earn this. 100 may sound like a big number, but you'll be facing a lot more Xenomorphs than this during your campaign playthrough.

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Cumulative trophy. The main thing is not to forget to use the motion sensor more often (the default button ) in the time it takes you to get other trophies, you will receive this one.
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11 Feb 2013 14:44