In order to make this trophy easier you should learn at least level 1 of the Bend Time power. If you are on your Mostly Flesh and Steel playthrough, be sure to save the game beforehand.
During Mission 2: High Overseer Campbell, you will have to make your way past two Walls of Light. After the second one you will be able to enter Holger Square. Once you do you will encounter Overseer enemies—soldiers wearing grey uniforms and white masks with black on them—for the first time, which are the only enemies that throw grenades.
Kill the first Overseer in the square that is interrogating Martin, then use Blink to get over the right side of the wall. You will then encounter a lone Overseer. If you haven’t already saved your game and learned Bend Time level 1, you should do it now. Run up to him get his attention either by swinging your sword at him, or standing nearby. Once he pulls his sword start to walk backwards until he throws a grenade at you. Wait for it to hit the ground then use Bend Time. Pick up the grenade and then throw it back at him, making sure it rolls on the ground. If you try to throw it in the air the grenade will simply be stationary and possibly miss.
If he does not die from the grenade, pause and reload the save and repeat the process until you are successful. After he dies the trophy will unlock.
To see a complete walkthrough of the method being performed, please see the video below: