This achievement is easier than it sounds. You can start a kickoff match on amateur. Choose a team who has a player with good heading such as Bayern Munich(Gomez) or Athletico Madrid(Falcao). Then edit CPU customisation by pausing the match. Then go to settings and then game settings. Finally go to CPU game customisation. Change sprint speed, acceleration, GK ability, Positioning: Run Frequency, Line height and put first touch control to 100. This makes the CPU beyond useless even on legendary. Cross the ball to your striker and use + to shoot. You should get it in a few tries.