King of Fighters '98 Ultimate Match Cheats

Achievements
Complete each achievement to get the allotted gamerscore.

10 Continuous Wins (35): Achieve 10 straight wins in Xbox LIVE fight.
5 Continuous Wins (20): Achieve 5 straight wins in Xbox LIVE fight.
Assist Attack (5): Perform an assist attack ( Arcade Play Only ).
Champion (15): Finish the game (can continue) ( Arcade/Single Play Only ).
Perfect Match (5): Pass level perfectly in one round (without injury) ( Arcade/Single Play Only ).
Professional (20): Achieve 50 wins in Xbox LIVE fight.
Rookie (10): Achieve 10 wins in Xbox LIVE fight.
Score Hunter (10): Highest point exceeds 300 thousand ( Arcade/Single Play Only ).
The King (35): Achieve 100 wins in Xbox LIVE fight.
The King of Fighters (30): Finish the game ( can't lose one round, can't continue) ( Arcade/Single Play Only ).
Uncontrollable (10): Iori(Ura) or Leona(Ura) appear as CPU ( Arcade/Single Play Only ).
Untouchable (5): Achieve straight win ( Arcade Play Only ).

Unlockable Characters
While playing in arcade mode if you get a certain amount of DM (Deadly Move) or SDM (Super Deadly Move) then you can unlock alternate characters. Highlight the character at the character select screen and press the back button.

Eiji, Kasumi: Have 3-5 DM or SDM finishes by the fourth match
Geonitz: Have 3-5 DM or SDM finishes by the final fight
Omega Rugal: Get less then 3 DM or SDM finishes by the final fight
Orochi: Have 6-9 DM or SDM finishes by the final fight
Rugal, Orochi Iori, Orochi Leona: Have 6-9 DM or SDM finishes and do not lose a single round by the fourth match