Complete Chapter 3 in Leon's campaign.

Kill 3 members of the opposing team with a melee attack before you die in Multiplayer

Successfully complete your first kill of an opposing team member in Multiplayer

Complete the "It's All Greek To Me" level

Perform a multi-kill with a melee weapon

Successfully kill an enemy with one shot

Destroy all of the piñatas in the "It's All Greek to Me" level

Purchase one skill.

Defeat an enemy while dying, then recover without any help.

Clear "Mysterious Alien Attack!!" in Dragon Ball Z: Budokai

Complete Chapter 6 - 3 on any difficulty setting.

Build up a certain level of trust with your partner.

Complete Chapter 5 - 3 on any difficulty setting.