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Area 51 Defense achievements progress.
Get 2 x Kill Combo two times.
72.7%
Get 5 x Killstreak five times.
59.0%
Two hundred targets destroyed.
50.9%
Two thousand enemies eliminated.
18.1%
Twenty thousand foes removed.
10.9%
Two hundred thousand adversaries decimated.
10.9%
Two million invaders liquified.
10.9%
Survive through ten waves without a single airstrike.
10.9%
Survive through five waves without health power-ups.
11.8%
