The Assault Rifle counts towards the “He hasn’t covered wars…” achievement where you have to use every type of firearm on a zombie.  It’s important to note that the Assault Rifle in question is NOT the same as the Merc Assault Rifle found during the Cases.

The Assault Rifle can be found in the Food Court above Hungry Joe’s Pizza.

To get up there, circle around to the left until you find a set of vending machines against the wall.  You should be able to climb on top of the vending machines and jump up to climb on top of the stores.  Now all you need to do is run back along the roofs until you’re on top of Hungry Joe’s.  The tricky bit is that the rifle is on the awning and not the roof itself so jump down from Hungry Joe’s onto the awning and the Assault Rifle is yours.

Now shoot some zombies and watch the achievement pop (assuming you’ve already used the other firearms).

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