My friend is missing some old achievements (saviors in Cov) but still reached the de facto cap of 86 in hero's fortitude. Possiby from achievements in new content.
There is also a related bug - which actually occurred before the expansion went live - Heroics started showing a +1 for all maximums, where no achievement/reward existed. This has now rolled over, so the current displayed max of 95/48/95, should actually be 94/47/94