Complete Chapter 2 - 3 on any difficulty setting.

Defeat 20 enemies with physical attacks.

Pull off 20 headshots.

Defeat 3 Majini at once with a drum or gas tank explosion.

Defeat 5 enemies with the Knife.

You unlocked the special ability of buying guns from Little Jacob.

You completed the mission "Uncle Vlad".

You unlocked the special ability of Roman's taxi.

You killed 5 opposing team members.

You killed a Rockstar in multiplayer.