Ok so apparently all you need is to rent Avatar: The Last Airbender: The Burning Earth, then start a new game and go stand against a railing and just keep attacking… for some reason the game glitches and just keeps unlocking all the achievements:
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1000 Achievement Points in a Few Minutes
Nov 19, 2007 
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This post was written by:
Riyad Kalla - who has written 1727 posts on The “Break it Down” Blog.
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November 19th, 2007 at 11:16 am
It’s not a glitch, it’s a lazy developer.
It appears that all the achievements are for hitting enemies consecutively — which is what you are doing.
(Trying to remember from the video I watched last night)
November 19th, 2007 at 11:24 am
Haha, super awesome achievement logic…
You rent it yet?
November 19th, 2007 at 6:47 pm
CATS: All you achievement points are belong to us….