|Earn 10 Assists in any Co-op game.|
In a co-op Survival game build a mortar in the very front. Keep the mortar at level 1. Build a Machine-Gun next to the mortar. Make your friend use the mortar on a group of infantry. Then you, the one getting the achievement, shoot the enemies that are red and slowly losing health. You should get the achievement once you get the 10th assist.
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