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Start a game in Arcade mode, and set it to the easiest difficulty and one round. With any character, press [Hard Kick] repeatedly. You should defeat the CPU every time. After you have defeated all CPU opponents with every character, all characters except for Akuma and Gouken will be unlocked. To get "Perfects" and "Ultra Finishes" easier to unlock Akuma and Gouken, if a round is not going as desired, press Start on a second controller.

Successfully complete the indicated challenge with any character to unlock the corresponding bonus. Challenges must be completed in order to get the bonus. Note: Once a color is unlocked, it can be used by any character.

Time Attack (Normal) 1: Color 3
Time Attack (Normal) 2: Personal Action 2
Time Attack (Normal) 3: Title
Time Attack (Normal) 4: Title
Time Attack (Normal) 5: Title
Time Attack (Normal) 6: Color 5
Time Attack (Normal) 7: Personal Action 4
Time Attack (Normal) 8: Title
Time Attack (Normal) 9: Title
Time Attack (Normal) 10: Title
Time Attack (Normal) 11: Color 7
Time Attack (Normal) 12: Personal Action 6
Time Attack (Normal) 13: Title
Time Attack (Normal) 14: Title
Time Attack (Normal) 15: Title
Time Attack (Normal) 16: Color 9
Time Attack (Normal) 17: Personal Action 8
Time Attack (Normal) 18: Title
Time Attack (Normal) 19: Title
Time Attack (Normal) 20: Title
Time Attack (Hard) 1: Title
Time Attack (Hard) 2: Unknown
Time Attack (Hard) 3: Unknown
Time Attack (Hard) 4: Unknown
Time Attack (Hard) 5: Unknown
Survival (Normal) 1: Color 4
Survival (Normal) 2: Personal Action 3
Survival (Normal) 3: Title
Survival (Normal) 4: Title
Survival (Normal) 5: Title
Survival (Normal) 6: Color 6
Survival (Normal) 7: Personal Action 5
Survival (Normal) 8: Title
Survival (Normal) 9: Title
Survival (Normal) 10: Title
Survival (Normal) 11: Color 8
Survival (Normal) 12: Personal Action 7
Survival (Normal) 13: Title
Survival (Normal) 14: Title
Survival (Normal) 15: Title
Survival (Normal) 16: Color 10
Survival (Normal) 17: Personal Action 9
Survival (Normal) 18: Title
Survival (Normal) 19: Title
Survival (Normal) 20: Title
Survival (Hard) 1: Title
Survival (Hard) 2: Title
Survival (Hard) 3: Title
Survival (Hard) 4: Title
Survival (Hard) 5: Personal Action 9

Successfully complete a character's Combo Challenge to unlock his or her artwork at the "Gallery" menu.

Successfully complete Arcade mode with a character to unlock his or her prologue and ending movies at the "Gallery" menu.

Successfully complete Arcade mode to unlock an option to change the voices to Japanese at the "Options" menu.

Note: This trick requires two controllers. Play in Arcade mode, and when you are about to lose a round, press Start on the second controller. Do this to get "Perfects" and "Ultra Finishes" easier for the "Legendary Champion" achievement. -From: JNag

Accomplish the indicated achievement to get the corresponding number of Gamerscore points:

The World Warrior (20 points): Unlock all characters.
Color Guard (10 points): Unlock all Colors.
No Sweat (10 points): Unlock all Personal Actions.
Title Master (50 points): Collect all Titles.
Icon Master (50 points): Collect all Icons.
Special Move Master (10 points): Perform 100 Special Moves.
EX-cellent Master (20 points): Perform 100 EX Special Moves.
Super Combo Master (10 points): Perform 100 Super Combos.
Ultra Combo Master (10 points): Perform 100 Ultra Combos.
Focus Master (10 points): Perform 100 successful Focus Attacks.
Crowd Pleasing Master (10 points): Perform 10 Personal Actions.
Super Combo Champion (10 points): Perform 50 Super Combo finishes.
Ultra Combo Champion (10 points): Perform 50 Ultra Combo finishes.
Sunny Daze (40 points): Perform 365 flashy background finishes.
Simply Perfect (10 points): Achieve 10 Perfect victories.
Arcade Rat (20 points): Clear Arcade Mode with 1 character on Medium or higher difficulty.
Storied Reputation (30 points): Clear Arcade Mode with all characters on Medium or higher difficulty.
Save Your Quarters (30 points): Clear Arcade Mode without using a single continue on Medium or higher difficulty.
World Champion (30 points): Clear Arcade Mode on Hardest difficulty.
Legendary Champion (50 points): Defeat Gouken and clear Arcade Mode in Hardest difficulty.
Challenger (10 points): Clear a Challenge in Challenge Mode.
Challenge Expert (30 points): Clear all Challenges in Challenge Mode.
The Gold Standard (50 points): Earn gold medals in all challenges.
Rapid Fighter (10 points): Clear NORMAL Time Attack in Challenge Mode.
Speed King (20 points): Clear HARD Time Attack in Challenge Mode.
Tough Cookie (10 points): Clear NORMAL Survival in Challenge Mode.
Last Man Standing (20 points): Clear HARD Survival in Challenge Mode.
Technical Fighter (10 points): Clear NORMAL Trial in Challenge Mode.
No Challenge Too Hard (20 points): Clear HARD Trial in Challenge Mode.
All Dolled Up (10 points): Set your Title and Icon.
Medals Get! (30 points): Collect all Medal types.
Medal Collector (10 points): Collect 100 Medals.
Medal Hunter (10 points): Collect 500 Medals.
Medal Master (30 points): Collect 1,000 Medals.
Lobbyist (10 points): Create 10 multiplayer lobbies.
Taking On All Comers (10 points): Fight 10 opponents via fight requests.
The Road to Battle (10 points): Play 100 Xbox LIVE battles. (Ranked match or player match)
Hard Fought Battles (20 points): Play 200 Xbox LIVE battles. (Ranked match or player match)
Proof of Battle (20 points): Play 500 Xbox LIVE battles. (Ranked match or player match)
Way of the Fist (10 points): Win 5 Xbox LIVE battles. (Ranked match or player match)
The Journey Begins (20 points): Win 10 Xbox LIVE battles. (Ranked match or player match)
10 Years Too Early (20 points): Win 50 Xbox LIVE battles. (Ranked match or player match)
10 Years Too Late (50 points): Win 100 Xbox LIVE battles. (Ranked match or player match)
First Victory (20 points): Win 1 ranked match.
The Line Starts Here (20 points): Win 3 ranked matches in a row.
I Got Next! (30 points): Win 5 ranked matches in a row.
Playing To Win! (50 points): Win 10 ranked matches in a row.
Unbeatable Fist (0 points): Ruler of All.