I have a certificate somewhere that says I , at the time, was in the top youth orchestra in my state. This certificate in and of itself only serves to remind me of the fact that I had done that. I take pride in it only because of what it represents, not it's intrinsic value. I understand people wanting mementos, but the problem gets worse when you make those momentos have value in and of themselves like looking cool. I think the biggest problem is that in this game of virtual representations the certificates of achievement are also of value simply for aesthetics. Maybe if you could walk around with a few favorite "achievements" on your player card highlighted and make sure everyone gets at least access to any cosmetic you'd have less friction.
I don't know of any gold medalist who worked their butt off simply because the gold held more intrinsic value than a bronze.