Here is the complete list of unlockable achievements in Skullgirls on the Xbox 360 Arcade.
There are no secret achievements to unlock in this game.
An Ensemble Cast (10) – There may be no I in “team,” but there is in “variety”
Getting A Head In the Game (15) – Sometimes you just need to relax and take the weight off your shoulders
Good Hunting, Commander (15) – A good commander knows how to wield her forces effectively
Instant Hair Dash (15) – Let your parasite feel the wind between his tendrils
Medical Board Will Be Notified (15) – Your opponents aren’t the only ones under the knife
My Pain Will Be Visited Upon You (15) – Sometimes you can take it, and sometimes you just want to lash out
Prolix (20) – Words are fun – expand your vocabulary
Real Circus Damage (15) – And now, for the main attraction… Grappling!
Sküllgirls (20) – Graduation day has arrived at last! Mrs. Victoria’s so proud of you
The Kitchen Sink (15) – Throw everything at them, including…
Threads of Fate (30) – Follow all threads of fate to their inevitable conclusions
Toil and Trouble (15) – A sesquidecemvir of seven simulacra synergizing simultaneously