At the main menu, go to Xbox LIVE and select Head to Head Seasons. Then select Season game. You will be pitted against someone of the same division and the same star level (you won't play against FC Utrecht from the Dutch Eredivisie when you're using Man. Utd). Choose a team you're good with. To unlock this, you must win the match, and the match has to be played from start to end. If you're ahead and your opponent quits you will get 3 points, but no achievement.
Note: people usually quit when they're losing beyond hope. Getting too far ahead of them will increase the chance of them quitting. Either keep the difference low or try to keep possession for as long as possible.
Note #2: this achievement, Path to the Cup and Campaign Complete are the only ones that really require some skill. There's many different playstyles out there, and you need to figure out how to play as well. These three playstyles seem to be popular:
- Rusher Style. These players rush on you like mad to get the ball. Stay calm against them or they'll take the ball
- Barca Style. These players play like Barcelona; pass a lot and wait until they can give the final pass and score. Since they pass alot, it may be hard to get the ball. The Rusher Style appears to work best against them.
- Waiting Style. These players have a lot of patience. Instead of immediately attacking the player with the ball, they wait to see what you do. These players don't give away too much space, so try to beat them with sprinting/crosses.