There are two operations you will need to play in order to unlock this achievement. You do not have to win the operation in order for it to unlock.
Red Tide
Brusilov Offensive
*You must complete the match.
If you don't want to play all 4 maps go into Server Browser and search for Brusilov Keep and Tsaritsym under Operations, completing these 2 maps will get you the Achievement.
Credits go to AHGreg and Arador from TrueAchievements