You will unlock this the first time you play a ranked match. It can be on any map, including the DLC. The quickest game is detailed below:
When you start, choose the minimum number of destination cards. Your partner will take the minimum also, and every turn will choose just one destination card until he runs out and then switch to drawing railway cards. You will focus on drawing railroad cards, always drawing two face down cards until you have 44 cards. Now start placing railways, placing the longest rail you can each turn. Once your train count drops to 2 or below, everyone takes a final turn and you will unlock this achievement.
The achievement will unlock after the final scores are displayed.