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Skullgirls

Extra Color Palettes (credit to BloodOfSin and Semi45a)

Beat "Story Mode" to unlock color 7 and beat "Arcade Mode" to unlock color 8.

Unlockable How to Unlock
Character's 7th color. Beat "Story Mode" with desired character.
Character's 8th color Beat "Arcade Mode" wIth desired character.
Unlock Color Pallate #9 Play 25 Versus Matches online/offline.

Unlock Arcade Stories (credit to Bubbleberry_VII)

 

Unlockable How to Unlock
Double's Story Beat Valentine's story.
Valentine's Story Beat all prior stories.

 

Trophies (credit to Guard Master)

There are 11 Bronze Trophies and 5 Silver Trophies.

Trophy Description
An Ensemble Cast (Silver) There may be no I in "team," but there is in "variety."
Breaking the Cycle (Bronze) Retaliate against repetition.
Call the Wardrobe Department (Silver) Make dozens of costume changes.
Getting A Head In the Game (Bronze) Sometimes you just need to relax and take the weight off your shoulders.
Good Hunting, Commander (Bronze) A good commander knows how to wield her forces effectively.
Happy Birthday (Bronze) You got a present!
Instant Hair Dash (Bronze) Let your parasite feel the wind between his tendrils.
Medical Board Will Be Notified (Bronze) Your opponents aren't the only ones under the knife.
My Pain Will Be Visited Upon You (Bronze) Sometimes you can take it, and sometimes you just want to lash out.
Prolix (Silver) Words are fun - expand your vocabulary.
Real Circus Damage (Bronze) And now, for the main attraction... Grappling!
Sküllgirls (Silver) Graduation day has arrived at last! Mrs. Victoria's so proud of you.
The Kitchen Sink (Bronze) Throw everything at them, including...
Threads of Fate (Silver) Follow all threads of fate to their inevitable conclusions.
Toil and Trouble (Bronze) A sesquidecemvir of seven simulacra synergizing simultaneously.
World Warrior Princess (Bronze) Wander the world... unintentionally.