The Incredible Hulk

HULK SMASH

I finally got this achievement today, and [item=97919] was the key to getting it. You do 1% of your normal damage while shrunk for 5 minutes.

1. 
   
2. Remove everything but your weapon.
3. 
   
4. Use [item=97919] before engaging.
5. 
   
6. Tag [npc=26668] first, then tag the [npc=26555] in the back of the room.
7. 
   
8. Move to the back right corner under the stairs.
9. 
   
10. Damage [npc=26555] to under 9,000 health.
11. 
    
12. Damage [npc=26668] to under 50% health.
13. 
    
14. Enjoy the achievement!
15. 
    

The comments to engage the boss before the Hulk helped me get credit for this when it's all I've needed for the meta for months after months and even Blizzard told on on a ticket it was bugged. As long as you engage the boss before pulling the Hulk, you'll get credit when she kills a hulk, otherwise you won't. I had my DK with 3 hulks pulled and she killed them all and nothing. I pulled her then a Hulk and finally got credit when it died. Great job figuring this out!