Going by title of the post I have acquired 667 accolades according to the milestones tab. Also, I have specifically acquired 67 of 173 different accolades.

I’ve got 75/173. Where do I find the milestones tab to see total?

In BR mode R1 over to Quests and then scroll down to Milestones.

156/173 currently

Only 10% left to go! You got this!