How do you unlock each of the Arms Manufacturers?

How do you unlock each of the Arms Manufacturers? - A Man Carrying a Woman in Black Tank Top while Looking at Each Other

There are 8 of them in total, but how do you get each of them?

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How do you unlock each of the Arms Manufacturers? - A Man and Woman Looking at Each Other while Dancing

How do you unlock each of the Arms Manufacturers? - Unrecognizable young bearded ethnic craftsman pointing with paintbrush at camera sitting at table in modern creative workshop

How do you unlock each of the Arms Manufacturers? - Mirror Reflection of a Hand Holding a Wrist

15 Things You Didn’t Know About the Arms Industry

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Pavel Danilyuk, Pavel Danilyuk, Andrea Piacquadio, Buse Doa