No More Medals in Notifications is a free and easy-to-use mod that removes the icon for bronze, silver, and gold medals in the notifications and the progress window, changing them into black icons. All you need to do is download and install this mod and then it will automatically replace the icons. There is no need to modify any code or to add any new files. All you have to do is open the game and then you will no longer be able to see the icons for medals in the notifications and in the progress window.

Now, this is not an official mod from Rockstar Games, but it is made by a fan of the game.