Battle Shin Akuma in Final battle Mode: When you have beaten the game on 7 or 8 difficulty setting select 'Final Battle' mode at the 'Character Select' screen and hold L1 + L2 and pick the fighter you want to use. Keep holding L1 + L2 until the Vs. Screen appears.
Unlock Arcade Balrog: In World Tour mode clear the USA course then highlight Balrog and press L2 or alternatively play the game for 8 hours.
Unlock Evil Ryu and Guile: In World Tour mode get your character to level 30 and 31.
Unlock Shin Akuma: In World Tour mode get your character to level 32 and beat Shin Akuma. Highlight Akuma and hold L2 and press X.
Unlock ALL Modes: Have a total of 96 hours of gameplay under 'Options'.
Unlock Classic Mode: Complete the game in under 3 hours. Have no Super Meter, Infinite Guard Meter or Air Recovery. Normal and Special do more damage.
Unlock Saikyou Mode: Complete the game in under 4 hours. Health and damage handicap.
Unlock Mazi Mode: Complete the game in under 5 hours. Only lose one match and take more damage.
Unlock Dramatic and Final Battle Modes: Using any character beat the game on the maximum difficulty.
Unlock Team Battle and Survival Mode: Complete World Tour with level 10 or higher