Go to "Multiplayer" and select "Public Match". Create your own game. Set the 
maximum number of players to 14 and reserved slots to 13. Set the game to first 
5 out of 9. Place bot players on the opposite team, and be the only player on 
your team. Start a match on the Buffalo Field. Eliminate as many players as 
possible, then let the last person shoot you. When they have won four, stay put, 
and win the last five by eliminating all the players. Rush straight to the right 
and the opposite team will line up on the opposite end. Keep shooting them and 
making new games with the same rules until you get the achievement.