Yaungolian Barbecue

I was under the impression that this was bugged while getting my Pub Crawler achievement but the trick is that during the second and third phases the adds cannot be allowed within the city. Once they are inside of the city and not under attack by anyone they start to target the buildings and throw torches.
My advice is:
1. Have a party member at each of the spawn points so the adds are always aggro'ed.
2. Aggro the last boss as soon as he spawns outside of the town. ( this will save some kiting)
3. ALWAYS face the boss away from the city so he cant use his line of fire spell on the city. This will cause the city to go up in flames.

Hope these simple tips help you.

Just got this achivment today solo with level 100 char.
Krasarang Wild Brew - mandatory.
Cover ancient passage, the pier and the bridge with the brews, guard the remaining (northern) double passage with yoursefl.
I think first wave matters so you need to zerg the ancient passage mobs and the bridge ones asap coz they seem to ignore guards, then go place ur brew and then finish off the remaining trash mobs. When p4 starts just guard the double passage and make sure you kill mobs before they get any close. If you place everything correctly and kill the boss in a couple of seconds before he casts anything - you will get the achivment.

Just completed this - couldn't get a video recorder working since the last time I did that was 2008, so hopefully screenshots will suffice! I noticed no one else was submitting anything visual and this doesn't always help everyone, so I went through the effort of doing this again so I could show everyone how it works :)

https://flic.kr/s/aHsmD1j9eP

Above is a link to the photo album where I screenshot where to place the Krasarang Wild Brews (1 on the dock, 2 bottleneck but aggro range of Ancient Passage, and 2 on the bridge also within aggro range), and then also where to position yourself once you've set up the defenses (explained in text strat below). Finally, a screenshot of a recommendation for how to kill the final boss.

Text strat:
Keep queueing and leaving until you get the Krasarang Wild Brew defenses (you'll see barrels of ale on fire from the start - if you see anything else feel free to leave unless you need them for Binan Village All-Star). Once you've started the brewing, focus on killing the scouts, not setting up the defenses. You'll want to make sure no fire is launched on the buildings and you have a clear mind to set the defenses rather than frantically placing them and then messing up or allowing the rear wave of scouts to set fire to a building. Once you've dispatched the scouts - start placing the defenses (refer to the screenshots linked above). Once that's complete, run to the north where you haven't placed any defenses and your priority is to ensure that all of those mobs get killed by you. Once you've completed the mobs of that side for each wave, mount up and monitor the other waves to ensure they don't break through (if you placed them correctly, this shouldn't happen, but good to make sure). Assuming you've done a good job monitoring the other waves but prioritising killing your waves in the north, the final boss will spawn. Run towards the boss, don't aggro, and wait for him to slowly pace around the village. Position behind him (underneath the arch that he passes through on his way to the village), and grab his attention so he faces you (but definitely away from any building) and kill him. Hopefully you're 120 so an instant kill should be easy to do. And with that, you should have your achievement!