Marvel Avengers Battle for Earth

Really simple. As you do the tutorial, you will notice that you have a icon that indicates you should raise your knee to perform a kick. When that icon is highlighted in gold, the meter is fully charged, and you will perform a super kick. A super kick is a launcher, and will launch your opponent in the air where you can proceed to pummel them before they hit the ground. This is "close-combat". Whennyou have performed this, the achievement will pop.