Threat Detected

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So this trophy/achievement is very easy to get, I got this without even trying to get it. So on the first mission Induction After the drone swarm you enter a building with lots of enemies. First take out the 5 enemies at the entrance then you will see lots of enemies on the balcony all you do is throw a threat grenade and it will easily mark 10+, Don't take too long because your teammates will kill some enemies over time.

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