For this achievement you need to complete a full squad building group, but don't worry as the first group is very easy. when you load up ultimate team go to single player and then squad building challenges. Now choose the lets get started challenge. You should have enough players in your squad to complete the challenges without loosing anyone you will miss. Just let the game auto build your squad but make sure to change the quality type to bronze or you may loose someone you don't want too. After submitting all three teams the Achievement should be yours.
If you would like a video guide for this achievement I will leave mine below.