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For this achievement, you'll want to play the beginning of the level like you are in a Pacifism game mode, and DO NOT shoot any enemies. Just slowly move around the level dodging any enemies for the first 90+ seconds. If you do not kill any enemies, it will take significantly longer for new and harder enemies to spawn. Once the blue diamonds and green diamonds spawn, you'll have to start shooting to protect yourself. Make sure to kill any enemies that are an imminent threat, but don't overdo it if possible. Remember, the less you kill, the easier it is! With about 1:00 left on the clock the pace will begin to pick up and more enemies will spawn.

Remember that you have three bombs at your disposal do don't forget to use them. Because of the limited time, I recommend using them if there is even a small chance of an enemy killing you. Just move around the map in circle shooting the enemies and using bombs for the reminder of time on the clock and the achievement should unlock once you complete the level without dying. Using this method will result in an extremely low score though.