Basically I'm close to getting all of the halo 3 achievements. I need to get the complete legendary (and heroic but getting legendary should unlock that also. The annoying thing is that I've done legendary before on an old profile but I need to do it again), I also need the points achievements and marathon man (which is the problem!!!!) I was on co-op with my bro and we got every terminal and yes I did wait until the little green arrow in the bottom left turned red before I left the terminal but after I got them all no achievement popped up!) I was wondering how to correctly access the terminals and whether the fact that I found tem all over a few days instead of all in one session makes any difference? please help!