Play the game in single player on Normal or Hardcore difficulty. This Achievement will unlock upon completion of the seventh mission, "History Repeats".
Note that the mission is in two parts, so when it first appears that the mission is complete, you're actually just loading into the second half.
Fly a drone up the center of the tower building in order to take out the soldiers on the balconies. It can be tricky to find cover from them if you just try to take it on foot.
Use your grenade launcher when you reach the rooftop to take out the soldiers quickly before tackling the helicopter. There is a rocket launcher on the roof that you can grab if you don't have any suitable weapons on you. Three lock-on shots will take the bird down.
Keep an eye on the meter at the top right when you are trying to secure the square in the final portion of the mission. You only need to hold off until that meter is full. Even if you lose some lives you should be able to pull it off without much difficulty on the Normal difficulty setting. If you do die, you can grab a tank near your redeployment location and work on the tanks that are approaching your position.