The Enemy of my Friend

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Get a higher individual score than your partner on all co-op missions

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This achievement is quite simple and should probably be attempted once you have already completed all the Co-Op missions at least once. This is because you will need to be familiar with the level design and enemy spawn points in order to get more kills and more medals than your partner. However, if you are playing with a partner who is communicating effectively, just have them let you get a majority of the kills. As a general reminder, each players points are located right o the bottom of the screen underneath their respective colored helmet icon.