Ping Pong Champion

Level 110 version (solo): Since a lot of the comments for this are old or complicated, try this...

1. 
   
2. Go to [zone=5892]
3. 
   
4. Once in Wyrmrest Temple, take the left drake.
5. 
   
6. Stay in the middle of the boss room. (Where the boss starts.)
7. 
   
8. Hurt [npc=55308] a little.
9. 
   
10. A purple transparent thing will appear. (Switch focus to it so it's easy to track, but don't attack it.)
11. 
    
12. Chase down that purple ball thing. (Meaning, try to get yourself to into the ball.)
13. 
    
14. It will change direction and the buff counter it has on it will increase.
15. 
    
16. Repeat steps 6 and 7 until the buff on the ball says 10 or higher.
17. 
    
18. Kill the boss.
19. 
    

Notes:

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• This was pretty easily soloable as a well geared Level 110.
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• Try to keep the ball in the middle of the room, if it hits an outer wall of the boss room you have to start over.
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• Since you are there by yourself, the boss will be right next to you the whole time.
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• The ball IS allowed to go back and forth through the boss without resetting anything.
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• The boss does things that slow you down. Various snare cancelling or sprint like abilities are helpful..
• 
  

Easy solo as hunter.

1) Misdirect boss to pet, put a couple hits in. Do not kill.

2) When Void ball spawns: chase it down, standing on top of it, it will change directions, do it 11 times just to be safe.

3) Nuke boss down after.

4) ?

5) Profit - Achievement Completed.

Got this achievement tonight, can confirm that as of Patch 4.3, you are required to bounce the orb at least 10 times before bouncing it into the boss. We pushed 3 bounces twice and then 11 bounces after the second dark phase and successfully earned this achievement.

Bouncing it 10 times or more in total over the course of the fight will not earn you the achievement, it has to be 10 bounces before a dark phase.