You Might Hurt Someone With That Achievement

Set targeting to Hard Lock and when enemy throws a grenade shoot it in air. http://www.youtube.com/watch?v=FImaJTTRByA

Chapter 5: Checkpoint 13 Simply shoot the faggot throwing the grenade at you just a little after another guy injures your boat with a grenade. Reload checkpoint, repeat 9 more times. Also a good spot for farming those SP challenges.

i actually pop this one during the graveyard chapter when he was with Passo. i stayed behind the tombstone and didnt kill the guy throwing grenades up top til the very end. easy farming til i finally decided to kill him.

Chapter 8 is a good place for this. Just keep letting the guy shoot grenades at you and then shootdodge every time you attempt to shoot one.

ive shot around 25 and still dont have this.

Molotov's don't count so chapter 5 does not work

In the Graveyard Chapter, when you get to the guy with a grenade launcher, just go into bullet time and shoot the grenades. if you run out of bullet time reload or kill the 2 or 3 enemies around him, but the problem is if you don't kill the guy fast he'll actually hit you with a grenade, therefore you can either switch covers or reload checkpoint.

You may do this achievement in no time, by simply going to Chapter 10: Checkpoint 12 and restart the chapter after shooting the grenade throwing at you in the bus.

There's only one grenade in the boat scenes in Chapter 5...best to hit a different chapter.

The easiest way to do this achievement is Chapter X: Checkpoint 12. It goes into bullet time for you and then just restart the checkpoint. I only had to do it twice when it popped.