See if I was to play Halo 3 on Legendary, on Co-op and complete it, would i

[Lewis A]

get the achievements ? Oh and do I have to do it all at once, or can I do them seperatly on different nights ?

 

[ternot2007]

Yes you would get the achievements.

You don't have to do it all at once and yes you can do them separately on different nights

 

[ternot2007]

Yes you would get the achievements.

You don't have to do it all at once and yes you can do them separately on different nights