Resident Evil Revelations

I'm surprised there are no guides on this since this is such an old game, well here it is. These are the four super rare weapons you need to obtain for this achievement:

1. High roller (sub machine gun)
2. Drake (a double barrel shotgun covered in dragon scales)
3. Pale rider (a magnum with a ridiculously large barrel, you'll know when you have it)
4. Murumasa (I believe this gun has gold accents all over it)

Now, it seemed that my tracking for this went up in increments of 33% which would indicate that you only need 3 of these weapons, but since we cannot confirm which 3 those are, these are the 4 super rare weapons In the game and so you these are the ones you should be keeping an eye out for and keeping track of which ones you've gotten so far until it pops which isn't too bad as there's only 4 of them. The way these guns can be obtained is through one of 3 ways. You may get lucky playing the early, easier stages of raid (chasm, trenches) and find one in the wepom case you obtain from killing a puffer fish, but if not you need to find an experienced runner who can take you through ghost ship speed runs until you get the ones you need, or you can register for an account on residentevil.net and purchase the guns with points that were given to you upon registering (30,000 points will be given) each gun costs 15,000 points so you will only be able to acquire 2 of them this way, but it should make the RNG factor a little bit less frustrating as you now only need 1 or 2 as opposed to 3 or 4. I did obtain one of my guns through RE.net but it was a nightmare getting registered i just somehow eventually managed to do it so I can't help you with that. I apologize for any typos or general mistakes I'm writing this guide very late at night.