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There's in game challenges you complete that you don't actually see until you beat the game, each one has a set amount of points and then a shop opens up after you beat the game where you can buy things with those points. If you played RE2 or 3 remake it has the same thing.
I honestly don't even need other weapons now but as I replay the game I buy a new weapon and just upgrade it more and more each play through until i get infinite ammo for it.