I clearly assassinated a ball carrier 5 metres away from my own goal and my achievement didn’t pop, I’m a little disheartened by this since this achievement is quite hard, and I am getting a bit tired of not having achievements pop when I complete the required task -.-
Update: this achievement is clearly bugged, I have done it another 4 times in a single game not one pop of the achievement >:(
Update 2: I got the achievement finally, you have to be literally be really close to the goal, and I mean it… Really close
How you managed to do it 4 times when most people who’ve tried haven’t even been able to do it once, I have no idea.
But if it didn’t pop, you may have been 6 meters away instead of 5. 
> How you managed to do it 4 times when most people who’ve tried haven’t even been able to do it once, I have no idea.
>
> But if it didn’t pop, you may have been 6 meters away instead of 5.
I guess it’s just luck, but it is getting quite annoying now, because 5 metres to this game could be right next to the damn goal before the guy scores