Unlocking All Weapons
Resident Evil 1 HD Remaster

There are 13 Weapons in Resident Evil 1 including the Survival Knifes; below are all the weapons and how to get them.

Weapons

Handgun:

This is Jill's Handgun; You have it at the start of the game playing as Jill and can be picked up by Chris after coming back to the hall to report to Wesker.

Chris's Survival Knife:

Chris's starting weapon.

Jill's Survival Knife:

Jill's starting weapon.

Shotgun:

Located in a room in the east side of the mansion, here is its location: (Red X)

After taking it, you need to put the "Broken Shotgun" (located at Green X) in its place to not trigger the trap.
As Jill, it is possible to trigger the trap and have Barry save you; to do so, pick the shotgun and get out of the room then open the opposite door, it would be locked, go back and try opening the door to the room that you got the Shotgun from and you won't be able to open it; a cutscene will play showing Barry saving you.
By doing this, you will also get the Achievement "What a Great Guy".

Assault Shotgun:

This is Richard's Shotgun; you can pick it up after he dies.

Grenade Launcher:

This is Forest's Grenade Launcher and it can only be picked up by Jill from the east side balcony at the 2F of the mansion (Green X).

Make sure to load all 3 different shells in it (Grenade Shells, Incendiary Shells and Acid Shells) for it to count for the Achievement.

Magnum Revolver:

In the Graveyard; here is the location: (Green X)

You will need the "Wind Crest" in order to retrieve it; you will find it in the room with insects in the 2F of the mansion in this location: (Yellow X)

Self-Defense Gun:

You will find it in the Residence, on top of the desk in this room: (Red X)

Flamethrower:

Can only be picked up by Chris in Courtyard B1 and can only be used there as you will need to put it back to unlock the door that you came from.

.44 Magnum Revolver:

This is Barry's Magnum Revolver; do not give it to him at the altar and you can pick it up.

Rocket Launcher:

Brad the Pilot will drop it on the helipad so you can finish the Tyrant.

Samurai Edge (Infinite Ammo):

Complete the game in under 5 hours in Normal or above difficulty.

Rocket Launcher (Infinite Ammo):

Complete the game in under 3 hours in Normal or above difficulty.

Achievement

After getting all the weapons on the same save file, you will get the Achievement "Starsenal".

The End

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