Below is a list of the different ways that special modes, characters and abilities are obtained in the game.
Unlock Justice: Beat at least 20 Missions in Mission mode or alternately complete her Story mode.
Unlock Kliff: Beat at least 10 Missions in Mission Mode or alternately complete his Story mode.
Alternate way of Unlocking GG Generations Mode: Get 50% GGX or 100% GG of the Arcade Gallery Artwork.
Play through Gold Arcade/M.O.M. Mode: Unlock ALL Gold Characters and hold L1.
Play through EX Arcade/M.O.M. Mode: Unlock ALL EX Characters and Hold L2.
To Play through Gold EX Arcade Mode: Unlock ALL Gold and EX characters and then hold L1 + L2 when starting Arcade/M.O.M. Modes.
Select #Reload Versions of Unlocked Extra Slash Stages: Hold the R2 (Respect) button over the stage and the title will turn Yellow (#R Stages will become unloocked automatically with every Slash stage you unlock).
Select EX Characters: Press 'Start' then Select 'EX Option' (also access GG Generations mode).
Select Gold Characters: Press Respect (R2) to toggle the 'Slash Color' Option and Press 'Dust' (R1).
Select Black Characters: Press Respect (R2) to toggle the 'Reload Color' Option and Press 'Dust' (R1).
Unlock ALL EX Characters/GG Generations Mode/Special Options: Beat ALL 30 missions in Mission mode.
Unlock specific EX Characters: Either play through at least one path of the characters Story mode or defeat the corresponding character's Black EX Form in Survival mode.
Unlock Specific Gold/Black Characters: Either play through ALL of that Character's Story paths in Story mode or defeat the corresponding character's Gold form in Survival mode.
Unlock Specific Extra GGXX Slash Stages: Play through a certain path in a Corresponding Character's Story mode
Unlock Special Illustration 1: Unlocks automatically.
Unlock Special Illustrations 2, 3, 4, 5, and 6: Beat Survival mode up to level 500.
Unlock Special Illustration 7: Unlock ALL Gold/Black Characters.
Unlock Special Illustration 8: Collect ALL Arcade mode Gallery Artwork.
Unlock Special Illustration 9: Collect ALL EX Arcade mode Gallery Artwork.
Unlock Special Illustration 10: Beat ALL of Survival mode up to level 1000.
Unlock Gallery 'Secrets' (Omake Extra Voice, Actor Interviews): These are time released once every few hours of gameplay.