Play as Akuma - At the character selection screen, highlight Hsien-Ko, then press Down.

Play as Anita - At the character selection screen, highlight Donovan, then hold Back + LB + RB and press A. You should start the match as Donovan's little sister.

Play as Bat Morrigan - At the character selection screen, highlight Morrigan, then hold Back + LB + RB and press A. You will transform when the match begins.

Play as Dan Hibiki - At the character selection screen, highlight Donovan, then press Down.

Play as Evilot - At the character selection screen, highlight Morrigan, then press Down.

Play as Hsien-Ko's Talisman - At the character selection screen, highlight Hsien-Ko, then hold Back + LB + RB and press A. You should be the Talisman when you start the match.

Alternate attack moves - At the character selection screen, hold LB or RB while selecting a character.

All blue counter-drop - At the character selection screen, hold Start while selecting a character.

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

Power Made Flesh (6 points): Play as Akuma in Arcade Mode (Normal or harder).
Meeting People is Easy (7 points): Join or Host a 4 person Player Match.
Power Made Flesh (6 points): Play as Akuma in any mode.
Meeting People is Easy (7 points): You joined or hosted a Four Player Match.
Get Your Feet Wet (7 points): Win three Ranked Matches of X or X' Mode.
Playing to Win (15 points): Win 20 Ranked Matches in X' mode.
Modern Battle Master (10 points): Complete X' Arcade Mode on Hard or Expert Difficulty.
Classic Battle Master (10 points): Complete X Arcade Mode on Hard or Expert Difficulty.
Alternative Lifestyles (10 points): Complete Y or Z Arcade Modes on Hard or Expert Difficulty.
Quarter Miser (10 points): Complete Arcade Mode (Normal or harder) without continuing.
The Mother Lode (25 points): Break a Power Gem of size 25 or larger in Arcade Mode (Normal or harder).
The Longest Journey (30 points): Complete X' Mode on Hard or Expert Mode using only Dan.
Chain, Chain, Chain, (30 points): Perform a 5 chain combo in X or X' Arcade Mode (Normal or harder).
Chain of Jewels… (40 points): Perform a 7 chain combo in X or X' Arcade Mode (Normal or harder).