Burning Bridges

Please note that this is not verified and just my own suspicions on how the achievement is supposed to work:

During the fight, Krosus uses Burning Pitch which spawns Burning Embers if not stood under when it lands. Most of these land out in the ranged, but there are some that spawn in the melee towards the front on the section of the bridge that the fight is currently being fought at. After a few slams, he breaks the bridge which normally would send anyone still on it into the water for an insta-death.

What this achievement likely entails is intentionally letting embers spawn on the bridge section that is about to shatter, leaving them alive until the shatter occurs, and any embers alive on that bridge segment will be killed by dropping into the water, thus quenching them. As long as 15 have been killed in this way, the achievement will be awarded upon Krosus's death.

EDIT: Turns out I was right. Yay for semi-guided guessing! Thanks for the verification YariniCeteri <3

Did this achievement on live server January 20th. Silhac had the right idea with his proposed theory, so credit to him.

As far as our particular strat goes, the boss will kill any living fire adds on the section of bridge as it's destroyed when he does his Slams. You need 15 adds to be killed in this manner total and since the 4th section of bridge breaking kills your entire raid, this means you only have 3 sets of bridge breaks to kill 15 adds.

We did this with a group of 13 people, and as such weren't having nearly as many embers spawning in front, so what we ended up doing was leaving the next 2 sections of bridges that would be destroyed clear and allowing all the adds in those sections to spawn. Once spawned, any classes that had unavoidable cleave mechanics would stop DPS'ing to avoid killing the adds, as they have very little health and have to survive for over a minute. Every time the boss breaks a section and throws the adds into the water, the new section behind us would already have some adds we had left. And that's it. Track the achievement and it goes from red to white once you have enough, so no need to keep track of how many you've got.

Tips:
- Bigger raid size means more adds spawning, but also of course more people to kill them accidentally (don't blood boil imsorryteam)

- Overheal it. I can't stress how healing intensive this fight becomes when you have 5-8 adds freecasting every second at random people on top of slams, orbs (especially when you're on the last section) and beams if you're not paying attention. The tank damage can also get rough as a lot of classes can't properly execute their rotations to build their resource and get active mitigation going for fear or cleaving the adds, so a dedicated tank healer isn't a bad idea.

- The adds can't be moved with Death Grip, Gorefiend's Grasp, or Typhoon. Didn't try anything else but there's no reason to think it would work.

FrostyShot#1667 if you have questions.

Easy Solo for Hunter Class Level 120 Battle for Azeroth and Beyond...
(or virtually any class with enough healing if you don't have feign death...)

0. Track Achievement, it will turn from Red to White when Achievement is completed.

1. Normal Difficulty.

2. Jump on down to the Shattered Walkway.

3. Take your pet out.

4. Feign Death at the beginning of the walkway (the area furthest from Krosus)

5. Order your pet to attack the boss. Stay feigned death the entire fight. You'll notice the fire mobs spawn and just stand there, they won't attack you because they don't know about you.

6. Let your pet attack the boss until his health is down to maybe 10%

7. Then order your pet to stop attacking so the boss doesn't die before the achievement is satisfied.

8. The walkway will eventually be shattered up till the point where there's only a small piece left, where you've been successfully feigned death the entire time.

9. At this point there should be 15 dead fire mobs that have fallen into the water below, and if you were tracking the achievement it should be satisfied now.

10. Get up and Kill Krosus.

11. ?

12. Profit. Achievement Completed.