Kill at least 10 enemies with one Predator missile in Single Player or Special Ops.

Kill 2 enemies with a single bullet in Single Player or Special Ops.

Knife an enemy without him ever knowing you were there in Single Player or Special Ops.

Kill at least 3 enemies with a single shot from a grenade launcher in Single Player or Special Ops.

Perform 50 Ultra Combo finishes.

Kill 3 monsters with a single physical object drop or throw

Venture into Killer Croc's lair and come out alive

Conquer the effects of the Scarecrow's fear gas

Defeat 50 enemies with the 92FS - 9mm

Defeat three enemies with one explosion

Defeat 100 enemies with headshots

Defeat 30 enemies with Mk-NDI grenades