Halo 3 campaign question?

[Moral]

im playing halo3 campaign on legendary and almost done... i got to the last levels and need a little help (im not THAT bad haha)... am i allowed to do the rest of it on co-op but still get the points?

 

[Foost]

Actually no i don't think so, because you can only play at places you beat in co-op for beating it... Sorry if this is confusing.

 

[plies fan]

id problobly say you could but if u dont have xbox live then co-ops funner

 

[Andy]

come on man, you got to beat the whole game yourself

 

[Piper]

You can do it on Xbox live and still get the points. Also Co-op will get you points. But I say xbox live is WAY funner!
Ans yea, I am a girl, who plays Halo 3.