Marvel vs. Capcom 2 Cheats

Enter it in at the versus screen after you select your characters, and hold it until the match begins

Total number of Single Player Achievements: 4
Total number of Multiplayer Achievements: 8
Total Points: 200

Avengers Assemble!Avengers Assemble!
Reward: 20 Points
Objective: Beat the game with Avengers theme team.

Vampire SaviorsVampire Saviors
Reward: 10 Points
Objective: Beat the game with Darkstalkers theme team.

Uncanny HeroesUncanny Heroes
Reward: 10 Points
Objective: Beat the game with X-Men theme team.

World WarriorsWorld Warriors
Reward: 10 Points
Objective: Beat the game with Street Fighter theme team.

Multiplayer:

Mega Buster
Reward: 10 Points
Objective: Win 50 Ranked Matches online.

#1 in the Hood
Reward: 20 Points
Objective: Win 100 Ranked Matches online.

I Am Doom
Reward: 20 Points
Objective: Defeat opponent in under 15 seconds.

Hyakuretsu Kyaku
Reward: 10 Points
Objective: Perform a 100 hit combo.

Berserker Barrage
Reward: 20 Points
Objective: Perform a 200 hit combo.

Shun Goku Satsu
Reward: 10 Points
Objective: Perform a 3 part hyper combo.

The Best There Is (At What I Do)
Reward: 50 Points
Objective: Perform 50 One Character Victories within 20 unique teams.

Get Out Of Here!!!
Reward: 10 Points
Objective: Perform 10 snapbacks within 20 unique teams.

After completing all achievements and then killing someone in 5-10 seconds x3 you should be able to have invincibility, powerful hits and a better team the next time you start a new game.