Play a round of Conquest on each of the launch maps
You need to play a game of Conquest in every of the launch maps and the launch maps are:
-Rotterdam
-Devastation
-Twisted Steel
-Hamada
-Aerodrome
-Arras
-Narvik
-Fjell 652
If you can't find a game of these maps just go to the Community Game Browser and from there the map you want to play and Conquest.