Complete HUMINT.

Kill 20 enemies using grenades. (Single Player)

Kill 50 enemies with head shots. (Single Player)

Throw an enemy over a ledge. (Single Player)

Smash an enemy's face into a wall. (Single Player)

Complete KISS.

Kill 5 enemies with an assault rifle without reloading or changing weapons. (Single Player)

Complete an entire level using only the pistol. (Single Player)

Complete chapters 2, 3, 4 and 5 on normal or hard difficulty

Complete Wakeup Call

Kill 200 enemies. (Multiplayer)

Finish the game quicker than the par time of 56 minutes in New York Minute mode.

Complete the game in Hard-Boiled mode.