First of all ensure you are connected to Xbox Live. On the "Home" screen at the bottom right there should be a tile saying 'Team of the Week'. Press this and it will automatically take you to your FIFA Ultimate Team area. Alternatively, simply go to "Play" and selecting FUT.
Go to the "Play" tab in the FIFA Ultimate Team menu and at the bottom will be another tile saying 'Team of the Week'. Click on this and then press the menu button to begin the challenge. You will need to select the difficulty with the higher difficulties granting you more coins. After this just play the match and the achievement will pop after the match no matter what the result.