|Complete any survivor mission|
You need to finish all 10 waves in either mission. Battle of Ghen Crag is the easier of the two maps, so you'll probably want to do that one first. If you just want this achievement, don't bother turning on any score multiplying modifiers, and it will be a breeze. Remember in Ghen Crag that different defense points are attacked on different waves, so make sure to move if necessary. In Abyss Canyon, take out the Archon in Wave 5 as soon as possible so it doesn't decimate the friendly battleships.
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