There are 5 weapon upgrades in Tormented Souls 2. Collecting all of them unlocks the Gunsmith trophy and achievement.
For the 10 weapons refer to Tormented Souls 2: Weapon Locations.
Upgrade #1: Metal Pipe 1 – Shotgun Upgrade
In the Convent, go to the Torture Museum (Other Side) and use the stretcher in the middle of the room to split the scarecrow. Go back to the Torture Museum in the real world and you can pick up the Shotgun pipe from the split corpse.
Upgrade #2: Compressed Air Canister (Small) – Nailer Upgrade
In the Convent, on the table in the upper part of the Library that you access through the Lady Chapel.
Upgrade #3: Metal Pipe 2 – Shotgun Upgrade
In the Processing Plant, on a small table in the 2F Dining Room that you can access through the Warehouse.
Upgrade #4: Coil Nail Drum – Automatic Nailer Upgrade
In the Cemetery, inside the coffin of the Burial Chamber behind the brick wall you need to destroy with the Sledgehammer.
Upgrade #5: Recoil Spring – Hand Cannon Upgrade
In the School, inside the locker in the Computer Lab that you use the Combination Key to open.
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