Area 51 Defense Achievements Here is the full list of all 11 Area 51 Defense achievements.Filter Achievement View View Image viewList view Sort by TrueSteamAchievement desc TrueSteamAchievement asc Achievement name desc Achievement name asc TSA Ratio desc TSA Ratio asc Gamers desc Gamers asc Steam order Date won desc Date won asc What are achievement flags? Click to find outApply 2 x 2 x ComboGet 2 x Kill Combo two times. 5 x 5 Kill StreakGet 5 x Killstreak five times. 200 KillsTwo hundred dweebs destroyed. 2000 KillsTwo thousand enemies eliminated. 20 000 KillsTwenty thousand enemies removed. 200 000 KillsTwo hundred thousand enemies decimated. 2 000 000 KillsTwo million dweebs liquified. Airstrike WithheldSurvive through 10 waves without a single airstrike. Health Pickups WithheldSurvive through five waves without health power-ups. 4:20 HourCompleted the game during the green hour. Night Wave CompletedSurvive through the night of the dweebs.