This achievement requires that you win a multiplayer match in less than 2 minutes. The only game mode this is realistically possible in with a limited number of players (you plus one other player) is custom Capture the Flag with the Score Limit set to 1. Quickly grab the flag and return it to your base to end the match; this should take around one minute. Choose Blockbuster or Congress as they are smaller maps. Make sure to constantly utilize the sprint button (below and to left of shoot button) during the flag run to ensure you beat the 2-minute limit.