I'll Drink To ThatG 5

This achievement requires that you drink grog from your tankard while at an outpost at the same time as another crew.

You can sometimes coordinate this through friendly game chat, or do what I did and show up at an outpost while another crew is there and drink from your tankard while the crew is on the island.

I was then killed by the other crew, but hey it all counts the same (don't have treasure on board if you try my method).