This achievement requires that you win 5 games in a row. The game type or map does not matter as long as you dont lose a game. Both ranked and custom matches count towards this. It doesnt have to be done in one sitting. The quickest way to complete this is to play custom Capture the Flag matches with the Score Limit set to 1. Run across the map, grab the flag and return it to your base to win. Each match will take 2 minutes including load times. You do need at least one other player in order to start the match. Keep switching the map to maintain progress towards "World Tour."