ULTIMATE MARVEL VS CAPCOM 3

A Crossover Combination is performed when you have 3 or more Hyper Combo Gauge Bars, and hit Both assist buttons at the same time (LB+RB). All your characters will come out and use an Ultra all at once, so you need to have atleast 2 characters alive to do this. If you kill an opponents LAST character with this, it will count as a Crossover Combination Finish. This is easier to do if you active X factor first.

NOTE: The game is finicky about Awarding CCF's, if only one character is attacking when you kill them, it WILL NOT count (Meaning, your other characters finished their attacks and already hopped off screen)

The Crossover Combination is when all 3 of your characters do their finishing move at the same time. If your playing with "simple" controls, you need to hit Left Trigger and B when you are at level 3 on your combo bar (1 bar for each characters special move).

You have to finish your opposition, so better safe than sorry, make sure to kill 2 of their characters, then beat their 3rd character down to almost nothing, and perform this. You should be able to consistently do this vs the computer on easier settings. 30 times and the achievement is yours.

Obviously all 3 of your characters need to be alive for this to work.