FIFA 15 - Knuckle Ball Achievement

Knuckle Ball: Score a goal with a knuckle shot.
I earned the achievement with this shot. I only used the B button to trigger a shot, nothing else (not holding down LT or whatever). Guess it's purely luck based if such a shot is triggered. I certainly tried a lot.
To make it easier play against a 1 star team on beginner level and reduce the AI sliders in the options and/or raise the player sliders (not sure if that helps, i only reduced a few AI sliders to give my players more room for shots).