Killzone Shadowfall Violence is the answer? Trophy
*Spoilers* This is done in Chapter 10. There will be 5 enemies in the first part of the mission, kill them before going outside. Once you're outside, turn off the cameras for both the lower and higher tiers, pick up the sniper rifle and then start killing everyone. You'll have 3 minutes to get the remaining 15 kills. Enemies will spawn all over the map so you'll have to run around from area to area to get kills. When you have about 35 seconds left is when you'll want to head to the sniping location. The trophy will pop after you assassinate Sinclair.
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