Downtown
Pump Shotgun
This gun is found on a corpse at the bank on James Street in the room with all the safety deposit boxes.
Stun Bomb
This can be found in a drawer on a military lookout when you enter/exit the dome.
Capitol Hill
Trap Mine
To reach this collectible, interact with the green dumpster to the right of the inn and drag it underneath an accessible balcony. Climb up to the balcony then enter the hotel room. The weapon can be found on the bed with the red and white comforter in the inn.
Hillcrest
Bow
This weapon is obtained automatically as part of the story.
On Foot
Hunting Pistol
This pistol can be found in a safe located in the building across from the rusty construction trailer. To reach the safe, you will need to enter the crack in the wall. The safe combo is 17-38-07, which can be found on a lottery ticket on the bulletin board in the trailer.
Hostile Territory
Double Barrel Shotgun
To reach this gun, use the stairs leading up in the Ruby Dragon, defeat the two Clickers in there then jump across to King Street Relics. After you drop down the hole in the floor, grab the gun from behind the counter.
The Coast
Crossbow
This weapon is obtained automatically as part of the story.
The Descent
Flamethrower
After getting attacked by the Infected growing in the wall, follow the path around and jump down to a lower level. Enter through the doorway and turn right following along the windows then jump across the gap in the floor to the room across the way. You will be attacked by a Clicker. Defeat it then keep heading forward through the room. Take a right at the dead end towards a dark hallway. Take a right and squeeze through a cracked door to enter a bathroom. From there, cross over a narrow metal beam and duck through a small opening in the wall. The weapon will be on a corpse to the left in this room.
The Resort
Silenced Submachine Gun
This is obtained automatically as part of the story.