HALO CE: Terminal 5 Achievement Glitch

So… I got terminal 5 in the 5th mission. Assault on the Control Room. And under my achievements it shows up with the full white line showing that I completed it, but it doesn’t give me any gamerscore… I got no notification of the achievement popping. And yes my notifications are on, as I did other achievements and they came up just fine. Anyone else having this problem after the latest update?