Item description:

This is my save file, just finished playing mercenaries with all characters on all maps.

I think everything is unlocked, including Handcannon.


NOTE: Always remember to backup your own save before replacing it with mine. And I don't know if it unlocks any achievements when you load it for the first time, so use it at your own risk.

Rehash and resign with your own ID.

Load slot 11 for new round on professional mode, sell all the treasures and buy whatever special weapons you want, should be enough PTAS to buy most of the special ones.
You could load slot 12 (I think it's 12) and you only need to kill the last boss to unlock the achievement for beating the game on professional.