The "Yamamoto Isoroku" campaign is a complex, staged campaign that challenges even the most seasoned sea wolves via a series of Admiral Yamamoto’s historical battles. It requires a player to have ships of at least Tier VIII in order to complete, and is comprised of 54 different tasks spread out over 5 missions. There are achievements for both completing the campaign and completing all tasks in the campaign.
From the campaign's release in Update 0.6.9, a new mission unlocked every two weeks until all five were available. Each mission is comprised of various tasks; the campaign pins and rewards shown are granted only upon completing that particular task. Many tasks awards special Containers; these containers hold Collectibles that award an additional achievement if they were all collected over the course of the campaign.