|Silent but deadly||10|
|Covertly kill 25 unaware enemies|
Unaware enemy kills are stealth kills by sneaking up behind an enemy, and kills done while masked by noise. An easy way to boost this is to start the first mission and kill the guy at the start by stealth killing him from behind with the and restarting checkpoint. Repeat until the achievement unlocks.
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User Score is based on 155 user ratings.