In Halo 3, do you still get the campaign completion achievements if you play...

[Ben C]

...on co-op? I think that I would have to play through every level on co-op for it to count, but anything else I should know would be appreciated.

 

[battlefighters2]

yeah it does.

 

[season4digmon]

yes, i had to do co-op to beat some levels.

also if you do someone elses co-op and they are at a level you aren't at yet you have to do the levels you skipped for the achievement