To unlock this achievement you are required to be on the winning team for every map in ranked matches. The six maps in multiplayer are Remagen, Destroyed Village, The Hunt, Avalanche, Neptune, and Husky. The easiest game mode to get this done in, which will also net you progress towards the MP - Distinguished Service Medal and the MP - Distinguished Service Cross achievements, is Objective Airborne.
Side Note: If you haven’t started the multiplayer for this game yet, I recommend going for this achievement along with MP - World War II Victory Medal, and the MP - EAM Campaign Medal achievements all at the same time. Simply go trough all six maps, and make sure you come in first place and you are the winning team and all three achievements will unlock right when they are supposed to. Please refer to the solutions under MP – World War II Victory Medal achievement for further information and boosting methods.
I hope this solution helped! Leave a comment letting me know if there is any room for improvement! Thanks.