Trouble with spartan officer achievement on Halo 3?

[nate9462]

I already looked online whats the problem

 

[sunka2007]

I tried helping you before but wasn't sure which achievement you meant... you need 70 exp and a skill level of at least 10. If you didn't get it then you've got to be glitched... sorry.

Edit: See if this is any help. It does acknowledge that a problem may exist.
http://halo.wikia.com/wiki/Spartan_Officer

 

[k_3v1n_Lu_C3r0_]

its a random achievment dont worry it wil be ther before you know it my gt is kevin602L