Guild Wars 2

How can I complete the Emissary of the Mad King achievement? I’ve read that people are on 3/4 whereas I’m on 2/4. I’ve done the labyrinth, the clock tower puzzle, and even played a few rounds in both the Lunatic game and the Rumble game. Is something bugged? I have a feeling I’m missing out on something in the Lunatic game and the Rumble game, but I can’t figure out what!

Thanks in advance for any help

Now that I think about it, I might’ve mixed up Emissary of the Mad King and It’s a Mad King’s World. I got 3/4 on a It’s a Mad King’s World. What do you guys have on both the achievements?