For this trophy you will need to kill an Innocent Person, this can be either a civilian or a VIP. They are represented on your map as a white coloured circle. It is vital to note that killing a guard (Orange Circle) or the mission's target (Red Circle) will not count for this trophy! If you play the game stealthy and in the right 'spirit' then this trophy can be easily missed in your first full playthrough. If that does happen then it is not a problem, because you will get it when attempting 47 Kills in a Mission as you have to kill civilians in order to reach 47 kills.