i know there is other posts about this achievement. I was just wondering which fighter is the easiest to do this on?

Go Nuggets!

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↑ ↑ ↓ ↓ ← → ← → B A Start!

buchu is the easiest because if you dont get it you can simply quit and refight him..
just watch that when you switch sides the controls are the opposite as in street fighter so your kicks and punches reverse.. ie: up/left will be up/right if you jump over your foe and turn the other way
there are 3 up, 1 forward, 1 back, 3 down moves i beleive
the easiest way is hold the movement and then push the button using the analog or an arcade joystick (frogger/time pilot one found at walmart)

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Yie Ar Feedle

So those are all of the different types of moves?

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100%: Avatar:TLA:TBE, COD4, Dash of Destruction, Halo 3, Skate, Skate2. :)

Up+kick
Up/Back+kick
Up/Forward+kick
Back+kick
Forward+kick
Down+kick
Down/back+kick
Down/forward+kick

every hit must connect and when you jump over buchu or he switches sides the move is reversed
Ie: Forward + kick facing >>>>> turns to Back+kick when facing <<<<<<<<<
Some moves look the same.. up/forward+punch etc..

This may take 1 hour for the acheivement until you can practice it
best advice i can give is
HOLD THE BUTTON DOWN
then move the direction with the d pad
or if you have an arcade stick use that

its extremely fustrating but this is the best advice i can give
the kicks might be easier then the punches
and each hit must connect
when every hit connects buchu should be dead or close and youll see the acheivement at the end of the round

These two and the invincible are the hardest
again practice
practise
practise

memorize what each move looks like so you know if you screwed it up as well

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Yie Ar Feedle