Movin' On Up Achievement not unlocking

Games Other Halo
1

I was SR-19 when I entered some codes on waypoint. Now I am SR-21 but the achievement didn’t pop when I started Halo 4 up again.

Does anyone know a way to fix this?

Thanks in advance

2

I have the same problem I was SR 19 then I did some codes came back SR 22 and no Achievement

3

Try to keep ranking up. Perhaps the achievement unlocks after a certain amount of XP is gained? (Apart from the XP from the Waypoint codes)