Achievement: - Score 20 goals in 1 Arena Session
Once the game has finished loading you'll be in the arena kick about controlling a footballer from the chosen team you selected when you first started up the game. Simply score 20 goals for the achievement to unlock.
There's no time limit and no distance needed to score from so just run straight up to the net and shoot if you need to. Probably needs to be done in 1 session so once you start don't stop until you've hit the net 20 times.