It may seem like this trophy is a 'bang-bang' situation, but it's not. Carry the ball down the field along the field line, cutting in only as you close on the net. Use the touch screen now, while there is still some space for your teammates to work.
From there, bring your player down to the center of the field, that way you can head towards the net straight on. Once you've done that, tap the screen by the corner of the net, and your player should be able to score as long as you're inside the box.
Overall, a quick trophy to get, and one that's very easy to rinse and repeat if you don't have success right away. Head into exhibition match on amateur with a 5 star team against a 1 star team if you're not having much luck.