Must have DLC or sharing console with someone who does.
*Select Capture the Bag Match
*Before starting the match take a look at the map and find the rpg icon on the map.
*Match Starts - Grab a motorcycle and rush to the rpg, pick it up using

, then retreat back towards your starting point. Check your mini map and after your team has moved up near the enemy's bag, up on your motorcycle and head that way (avoid areas with a lot of enemies or possible land mines.) Run straight in to grab the bag and wait. Enemies will start coming your way. You have two shots with the RPG. Shoot them as they come in the door and get the achievement.
**With RPGs I recommend aiming more towards a wall or floor in case you miss the target to make sure it detonates and you still achieve the kill.
**A lot of the description seems simple but just trying to help those who aren't use to the game, weapon, or game mode.
Thanks enjoy what I believe to be the best shooter!