ULTIMATE MARVEL VS CAPCOM 3

You will need to finish arcade mode with every character possible including Galactus ( Back + LB + A on Arcade mode )

A quick way to do this is just play on very Easy with damage set to high and time set to 30 seconds, As long as you do a majority of the Damage within that 30 seconds you will win!

NOTE! THE CHARACTER THAT LANDS THE FINAL BLOW ON GALACTUS IS THE ONE YOU WILL GET THE ENDING FOR!

You don't recieve it for every character you use.
You also have to lose atleast once to see the Galactus game over ending.

If you can't remember who you have left to finish the game with, go to the Gallery and check Character Endings, anyone that has ???? means you havn't finished arcade mode with thm.

Good luck!

Beat Arcade Mode with every character, including Galactus. (Highlight Arcade Mode, Hold the Back Button and LB and while holding those press A. Instead of the character select screen you should go straight into a match with you playing as Galactus.)

NOTE: Visit the Gallery to see who's ending you have. Click Character Endings, every character listed you've beaten it with.

NOTE: If the Achievement doesn't unlock, visit the gallery and be sure you have every character ending (If you are missing an ending, there will be a ??????? instead of a character name). If you do have every ending, go through and watch every single ending in the gallery.

NOTE: You will get the Comic Collector achievement at the same time as this one.