This can be done with only 4 people, you don't need 6 like most of the other achievements. Create a ranked game of Team Leader on your favorite map. Invite 1 friend, and have the other 2 join your game quickly. Invited friend will be on your team, others will bump to other side. Now, either run to extraction, or have other team commit suicide (much quicker). Rinse and repeat 2 more times.