Spartan Ops - No achievement?

Games Other Halo
1

there is an achievement “Dedicated to Crimson” for beating all spartan ops missions in all 5 Episodes for the first season. i have done this (on Heroic or harder) and have not unlocked the achievement…anyone else having this issue or am i missing something to do with the achievement

2

You need to do ALL the missions SOLO or do them ALL co-op.

You can’t have a mix of both.

3

You need to do ALL the missions SOLO or do them ALL co-op.

You can’t have a mix of both.