I have to resort to using Print-Screens of the Store before I saunter over to Hadron to check weapons that I already have for the menu of Blessings to appear.
I suggest placing an obsidian/onyx square behind the icons for blessings in the list of weapons, for blessings that are already earned; either that, or making blessings that have yet to be earned stand out, e.g. making them shiny or something.