Burning Man

There are 6 Training Dummies at the upper part of where Brother Korloff is, 3 on the right and 3 on the left side. To complete this achievement you want him to use his Blazing Fists or Firestorm Kick abilities at all 6 of the Training Dummies. He doesnt move when he is doing them but he can be turned while doing Blazing Fists. When he does Firestorm Kick he jumps to a random target and starts channeling it so you can either have your whole group stack up at the Training Dummies and then run out fast when he starts doing it or just wait untill he does Blazing Fists at the tank and then he just faces him to the Dummies. Also remember that the Burning Man debuff on the Dummies is permanent so you can take as long as you like doing it.

Its a good idea not to DPS him at all if you are doing the achievement so he doesnt get Rising Flame stacks.

Very easy.

1) Clear ALL trash in and around boss area.

2) Aggro boss

3) Bring him over to a training dummy set, get all 3 to light on fire as he does his abilities.

4) Run over to the other side for the other 3 training dummies, he will light them on fire as well as he does his abilities.

5) With six training dummies on fire now, nuke down the boss.

6) Achievement Complete.

If you are like me and had a hard time figuring out which dummy sets to use, check out the screenshot uploaded by an awesome user.

The dummies are in sets of three, between the fountain pool and the covered walkways. On either side of the pool (the upper half, with the bowl fountain) there is a set of two benches. Opposite the benches, up against the walkway, there are three dummies. These dummies are also the only targetable ones. There will probably be trash adds attacking them when you first show up.

Once you've located the dummies, facepull Korloff, drag him to one set, wait for him to set them on fire, then drag him to the other. One shot him down and you're done!