Devastation achievement not unlocking

My friends and I recently went and decided to do halo 3 in under 2 hours together. I was the host and the only skulls that were on were grunt birthday party and IWHBYD. We had time on and we got the par time on every mission except covenant (exact times below). It has updated on way point but no achievement has unlocked. We did watch the prologue together as well as the epilogue. Any help?

Sierra 117: 12:23
Crows nest: 13:58
Tsavo highway: 9:09
The storm:10:47
Floodgate: 5:05
The ark: 19:19
The covenant: 23:27
Cortana:12:11
Halo: 19:39

Had a look on your service record and the times are indeed all updated (not doubting you, only leading in to the next part). That might mean that you have to run through a couple levels solo once again for it to sync properly for the achievement. I’m not sure if you have to do the last one or any one of your choice, but give that a shot.

> 2533274824050480;2:
> Had a look on your service record and the times are indeed all updated (not doubting you, only leading in to the next part). That might mean that you have to run through a couple levels solo once again for it to sync properly for the achievement. I’m not sure if you have to do the last one or any one of your choice, but give that a shot.

Thanks. Have been running through them again solo (on legendary for just the challenge and in case its needed). I’ve gotten to the storm (where the door glitched and hasn’t opened and I’m not going to keep going. Thanks for the response.

> 2533274887606659;3:
> > 2533274824050480;2:
> > Had a look on your service record and the times are indeed all updated (not doubting you, only leading in to the next part). That might mean that you have to run through a couple levels solo once again for it to sync properly for the achievement. I’m not sure if you have to do the last one or any one of your choice, but give that a shot.
>
> Thanks. Have been running through them again solo (on legendary for just the challenge and in case its needed). I’ve gotten to the storm (where the door glitched and hasn’t opened and I’m not going to keep going. Thanks for the response.

Can say now that after completing the halo 3 legendary playlist there is no achievement pop.

> 2533274887606659;4:
> > 2533274887606659;3:
> > > 2533274824050480;2:
> > > Had a look on your service record and the times are indeed all updated (not doubting you, only leading in to the next part). That might mean that you have to run through a couple levels solo once again for it to sync properly for the achievement. I’m not sure if you have to do the last one or any one of your choice, but give that a shot.
> >
> > Thanks. Have been running through them again solo (on legendary for just the challenge and in case its needed). I’ve gotten to the storm (where the door glitched and hasn’t opened and I’m not going to keep going. Thanks for the response.
>
> Can say now that after completing the halo 3 legendary playlist there is no achievement pop.

I’m having the same issue with Monopolized. There seem to be a few people suffering from this in the achievement thread. It might be something to do with the January update, since I got Goat Roped fine before.