I will update this guide accordingly as more information is found to make an achievement easier... if anyone has anything to add let me know...
12 World Warriors - 5
Play a match with all twelve characters in single player arcade mode
Simply play 1 match with each character in the single player arcade mode... not difficult
Perfection - 5
Complete a Perfect Match at Default Difficulty or Higher
Easiest way i found to get this achievement is to get to Zangief with anyone... lose to him and pick E. Honda... Stand still and just do the 100 Hand slap by rapidly pressing any punch button... Do this for both rounds, if you get hit, die and try again.
Bonus Bonanza - 10
Complete a Perfect Bonus Round
your best bet is to use someone with a rapid move... like E. Honda's punches, Chun-Li's Kicks, or Blanka's electrifying move (refer to the move list thread i made for more info: http://www.xbox360achievements.org/forum/showthread.php?t=6950)
Explanation of Bonus Rounds...
Every time you beat 3 fighters in the one player
modes, you will have to do a bonus game.
Destroy the car by damaging the right side of it
first, then jump over to the car's left side and
attack that enough times to destroy it for good.
Destroy the car before the timer runs out to
complete this bonus game.
Barrels are dropping down overhead. Destroy them
by attacking them. Destroy them all to complete
this bonus game.
BARRELS ON FIRE
Easy... smash all the barrels when they aren't on fire.
World Champion - 15
Complete single player arcade mode
Self explanatory... you can set the difficulty to easy to achieve this faster if you'd like
Perfect World Champion - 30
Complete single player arcade without losing a round
A little more difficult than the Hyper World Champion Achievement... you can't lose a round in any match when playing through the single player arcade mode... you can set the difficulty to easy to achieve this faster if you'd like
Hyper World Champion - 25
Complete single player arcade mode without losing a match
You can lose a round in single player arcade mode, as many times as you want, just don't lose the entire match against anyone. Complete the arcade mode under these stipulations... you can set the difficulty to easy to achieve this faster if you'd like
7 Stars - 20
Complete Single Player Arcade mode at Highest Difficulty
Self explanatory... make sure you have a lot of time on hand if you're going to attempt this
I Got Next - 5
Play a match in the online quarter mode
Just go online, and play a match in the Quarter Mode... you don't have to win
10 Tokens - 10
Play 10 Ranked Online Matches
play 10 ranked matches, you don't have to win
50 Tokens - 20
Play 50 Ranked Online Matches
play 50 ranked matches, you don't have to win
10 Online Victories - 20
Win 10 Ranked Online Matches
30 Online Victories - 35
Win 30 Ranked Online Matches