GW2 Bad Neighborhood achievement guide with detailed walkthrough. Bad Neighborhood is a new explorer achievement introduced with the Halloween patch. It is obtained via visiting a pirate cave in Queensdale near Divinity’s Reach.
Go to Ojon’s Lumbermill Waypoint near SE of Divinity’s Reach. If you swim across the lake and follow the dotted line, you will see a door guarded by some pirates. Behind the door is a pirate cave and there is a platform up top with the chest + achievement. Beware that the bandits have a quick respawn and there are some veterans. Bring a friend for best experience.