Dog Pile

Golden Lotus Daily Quest - The Battle Ring

Struggled as a ret paladin with the lack of aoe, so had to go Prot spec, and voila!
Got it straight after, nice and easy !

Edit: I love that people voted this down for sugesting Paladin's go Prot to help them get the kills within the time frame instead of trying it ret.

As many others have mentioned, this achievement wasn't dinging despite insta-nuking well over 10 at once.

I think the problem is if they all 'die' at the same time (easy with any aoe), they all act as the trigger that starts the 10second achievement countdown failing it, so try this and see if you have better success.

-Stand in center; gather your 10+ adds.
-Select one of them to nuke to trigger the achievement countdown.
-Nuke your one selected until he is defeated, countdown starts.
-Now AOE as you would and ding the achievement.

Important note. You need 10 "killing" blows. So if you are in a group or if someone else is there killing stuff, you wont get credit even if you tapped it if they get the final blow. So, you need to do this alone.