The challenger achievement doesn't unlock!

Games Other Halo
1

I have completed 25 challenges, yet I dont have the achievement. Is anyone else experiencing this problem?

2

bump

3

double bump

4

I would like some input on this, as I’m close to completing 25 Challenges and I’ll be quite annoyed if the achievement doesn’t unlock.

5

Mine popped when I got 26, try and get one more.

6

> Mine popped when I got 26, try and get one more.

Will try this.