Kill all enemies before you reach the escape capsule

Obtained at very end of the game on Act 7 - Chapter 2 where a 50 second countdown will start. You must kill all the enemies before you reach the escape capsule. Again I personally like using the Penetrator drill type weapon because its a one shot kill weapon. There are roughly about 5 enemies that you must kill. Your trophy will unlock in the escape capsule. If not you can just reload your checkpoint and try again.