To unlock Ryo Sakazaki for play, complete Arcade mode without losing a round.

To unlock Cheat mode, during game play while holding Start, press A + X + Y.

To fight Ryo Sakazaki, complete Single-Player mode without losing a round.

ACHIEVEMENT - HOW TO UNLOCK
Perfect Victory (5 points) - Defeat your opponent without taking any damage, in Arcade mode.
Complete the Game (15 points) - Beat Arcade mode.
Survival (30 points) - Beat Arcade mode without losing a round.
Perfect Victory (5 points) - Defeat your opponent without taking any damage in Arcade mode.
High Score (10 points) - Get 400,000 points in Arcade mode.
5 Straight Wins (20 points) - Get 5 straight wins on Xbox Live.
10 Straight Wins (35 points) - Get 10 straight wins on Xbox Live.
10 Wins (10 points) - Get 10 wins on Xbox Live.
50 Wins (20 points) - Get 50 wins on Xbox Live.
The King Of Fighters (35 points) - Get 100 wins on Xbox Live.
Flying Kim Bonus (5 points) - Unlock Flying Kim Bonus.
Mai's Folding Fans (5 points) - Unlock Mai's Folding Fans.