i have a few online questions about halo 3?

[varsolt]

first off can you get the achivements for beating the missions in inline co-op? second what level am i supposed to reach in online to get to usnc spartan and spartan officer?

answer appreciated
thank you

 

[ILuvurMom]

Achievements can be attained through online co-op.

Sorry I can't help you with the online rankings though.