Corner Maestro Achievement
Score off the post or cross bar in a match.
This achievement requires that you score directly from a corner kick and is one of the trickier achievements in the game. Corner kicks are awarded when the ball crosses the offensive end line and goes out of bounds, having last been touched by an opponent. The easiest way to get corner kicks to the dribble the ball down near the goal line. Then come in towards the net from a bad angle and take a shot. More often than not, the ball will be saved by the goalie, but will deflect out of bounds, awarding you a corner kick.
To score directly from a corner kick, the player taking the kick must be awarded the goal. Once you enter the corner kick camera angle, swipe left or right to rotate the camera until you are shooting directly along the goal line, or just a shade off the line. Then just swipe straight up towards the net as fast as you can. With any luck, the ball will either go directly in, or bounce of the goalkeeper and go in. Either one will unlock this achievement. However, if it bounced off a defending player (other than the keeper), it will count as an own goal and NOT unlock this achievement. This achievement will likely take many many attempts to unlock. It really requires more luck that skill. Earning a corner kick is very easy, so this achievement shouldn't take too long to obtain.
Scoring directly from a corner kick will also satisfy the requirement to unlock the "Long Range" achievement.