Kill 150 enemies using weapon finishers.

Complete all levels on realistic difficulty.

Mute the music.

Stick 50 sharp weapons into the heads of enemies.

Kill 75 enemies using explosives.

Damage 100 enemies using rope.

Shoot 500 enemies.

Escape from grapples 50 times.

Get an S-Rating on 20 levels.

Kill 4000 enemies.

Electrocute 100 enemies.

Let 100 enemies kill each other.