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Easy Survivalist and Killing Spree achievements
Select the Area 51 Challenge. Begin by killing everything in sight. Wait for the big metal robot to appear from the right. Do not destroy it; it does not kill you. As soon as it enters the screen, stand directly under it and begin shooting in the opposite direction. You will easily kill everything that appears from the left side and the enemies jumping over the robot. Keep doing this for about twenty minutes to unlock both achievements at the same time.
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Hats
Successfully complete the indicated task to unlock the corresponding hat:
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Achievements
Do the following things to obtain the corresponding Gamerscore points:
| 5 Points |
| Alien in Training | Finish level 1-1. | | | 10 Points | | Hungry Yeti | Eat 50 KGB Agents with the Yeti. | | | City Destroyer | Destroy 25 buildings during one game. | | | Juvenile Alien | Finish the game on the Easy difficulty. | | | 15 Points | | Killing Spree | Kill 1,000 enemies during one game. | | | Adult Alien | Finish the game on the Medium difficulty. | | | 20 Points | | Mad Hatter | Unlock all 31 hats. | | | Head Chomper | Head bite 50 enemies without touching the ground or firing. | | | Expert Alien | Finish the game on the Hard difficulty. | | | WMD | Reach 5000 km in Super Soviet Missile Master. | | | 25 Points | | Survivalist | Survive any challenge mode for 20 minutes. | | | 30 Points | | Perfect Flight | Overcome the final Boss without using a continue. | | | | | | | | | | | | | |
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