First off alot of people got 200/200 pre game updates...
ok so heres a way to remove the update
clear your memory cache and play the game OFFLINE
yes...
this removes the patch that stops the acheivement from unlocking

Now go find that code which makes you invulrnerable or play the game through and let me know if it worked

im 99% sure it will.. i have to test this myself but since the game gets the update that messes things up no?

correct me if im wrong

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Yie Ar Feedle

im pretty sure that everybody that has 200/200 in this game has cheated.  i am almost positive it was never possible to get the last achievement.  i have many friends that have probably already tried your method, they dont give up easily.  i would say dont waste your time on this one.

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I taught Eyedea to punch kids in the face.
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╚╝

well if you check the topic which lists the players with 200/200
most of them have been caught cheating
one player told me he got the acheivement when the game first came out pre patches
so unless someone tries this and prooves it wrong then there is a few legit people who have gotten it

thus it means you need to do it offline and remove the game update
i will try this on the weekend and post my results
hopefully someone else can do the same

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Yie Ar Feedle

Ok heres an update though its not much of one

I played the game with the patch off and played offline
started at level 3 and did invulnerable

and beat the game

and NOTHING

so ill have to waste 3 hours of my life and try from level 1 to the end...

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Yie Ar Feedle

dude, im not calling the guy with 200/200 a liar but i have a lot of XBLA gamers on my friends list and none of them have 200 in this game.  and no offense to anyone but most of those gamers can run circles around 95% of the gaming community.  if there was a way to get 200 in this game without cheating, then i know for a fact at least 7 of my friends (who will remain unnamed) would have 200 in this game.  im not going to tell you what to believe, but 3 years of this game having a gloitched achievement is pretty solid evidence that you are more than likely wasting your time trying to figure this out. 

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I taught Eyedea to punch kids in the face.
╔┐
╚╝

the whole point is the game has an update though and no one will know if there is ever a NEW update since nothing is new news about this game...
Midway doesnt care and microsoft doesnt seam to care about changing it either
so another game which should be listed at 150/150

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Yie Ar Feedle