Payday: The Heist

During the heist in First World Bank there will be two SWAT units that are planting C4 explosives on the windows. One SWAT unit will plant the C4 on the windows in the cafeteria and later one will plant C4 on the windows at the drill area. Therefore you will have two chances to get this during one heist. The units will plant the C4 after the assault has ended. Bane will say "Stay away from the windows" when one of them arrives. To get this trophy, you have to kill one of those SWAT units by any means. You can kill the SWAT unit either before or after the C4 detonates.

The easiest way to get this trophy is to use a trip mine. You will unlock one trip mine on the Sharpshooter tree at reputation 4. At the start of the heist, go outside the bank to the window either outside the cafeteria or the drill area. Now place a trip mine near the middle between the two windows. Make sure to place the trip mine on the floor as close as possible to the wall. The red laser should point upwards so that the trip mine doesn't activate on enemies that run pass the mine. This way, only the SWAT unit that will plant the C4 will activate the trip mine. Now you can play the heist as normal and eventually the trophy will pop.

Everyone in the heist will receive the trophy regardless which teammate that kills the SWAT unit with the C4.