Par scores achievements?

Has anyone else had problems unlocking these? I didn’t realize they changed the minimum score until earlier this week. So Since I finished all Spartan Ops missions solo on Legendary, I decided to do Par Scores.

I have now completed Halo 2’s Metropolis level twice now with a score of about 24,000 with the par score being 9,000 and still nothing. The progress bar hasn’t even moved. I’m wondering if it’s because the 9,000 point threshold was passed before 343 decided to decrease the par score.

wait they changed the par scores?

Yeah, by a significant amount.

what difficulty / skulls?

i have done this level 3 times now and it not once registered that I ve been the damn par score. On my last go I got par time as well and still no achievement for that. This level is broken

Anyone know of a decent guide to beating par scores?