so i need one more trophy to get platnium and i cant get this last one - Arm's Dealer, it requires you to buy everything from the weapon box i bought every weapon still didnt get it so i bought attachments for every kind of weapon example i got Acr bought red dot holograhpic Acog and Shotgun/Grenade luacher attachment did with MP5 and bought red dot holographic and acog

So what im asking is do u have to get EVERY attachment for EVERY gun if so.. WTF