Guild Wars 2

Can you still obtain these achievements since the removal of the Last Stand at Southsun release? Or will it be obtainable again in the future? Is there any other way to “redo” this release with its events because I really want to get those achievements

At this time, you are not able to obtain any achievements related to removed content. The achievements that are tied to objectives that still exist however can still be completed, such as eating a karka omelet.

In the future, they might replay some of the stories, since it’s possible that they could happen again, but even then, they would probably be counted as a new living story, leaving you unable to get the older achievements. For example, they could easily get the dredge and flame legion back together for a flame & frost part 2, or make a new karka king to destroy and reset southsun cove.

Not that we know of. The whole concept of a living story is a changing world, which means that it’s constantly in motion.