The only possible current "unlocking" method I know of is the process of Hex editing elaborated into detail by user alazz. I can't post links but investigate the thread he posted recently in this forum which allows you to unlock camouflages. He didn't mention this but you can also manipulate the codes for titles, emblems, weapon variants and attachments. If you follow his procedure for camouflages and extend it to everything else, in theory you can get whatever you want. Obviously you understand the risks of banishment from the game so do so at your own caution.