So, am I supposed to do anything?
One thing to do is to talk to the refugees in the camp in Lion’s Arch and then set out to find their missing items. In return, they give you a short story on what happened to them.
Apart from that, it is just killing invaders for that achievement.
But all this is just like a teaser. More things will come when it all starts for real.
So I haven’t done anything since part 1 (fixing signs, helping refugees), and I haven’t exactly been able to play at all the past month or so. I haven’t done the looking for missing items, and I just don’t feel like doing it. However, I don’t want to miss out on exclusive skins or armors, so it looks like I gotta find time by the 26th. :/