Deadly Premonition (PlayStation 3)

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10mm submachine gun

Successfully complete Sidequest #14: "Map To Psychic Spot A".

12Ga shotgun CQB

Successfully complete Sidequest #15: "Map To Psychic Spot B".

Axe

Re-enter the Sheriff Department Other World.

Chainsaw

Re-enter the Harry's Mansion Other World.

Free Items

At the Greenvale Sheriff's Office, go downstairs and find the shooting range. Shoot at a target until it says "Item Acquired!" Turn around and find the item you just earned! Each target has a different item. You can do this repeatedly.

Grass Cutter

Re-enter the Community Center Other World.

Light Sword

Successfully complete Sidequest #39: "Top Collector".

RPG

Successfully complete Sidequest #16: "Map To Psychic Spot C".

Wesley Special

Successfully complete Sidequest #50: "Ghost House Treasure".

Wrench

Successfully complete Sidequest #29: "Engagement Ring".