I’m debateing on wither or not to even play the Campaign in Halo reach, as i am not much of a single player, player. I prefer matchmaking, but if i ever wanted a break from MM, i would like to know how many credits i would earn if i played the Campaign start to finish on, say, Heroic.
Thanks 
It’s dependent on your rank, campaign commendation prgress and time it takes from you to complete a level. I, for example, am a Legend with most campaign commendations over silver (when a campaign commndation goes to silver, you stop earning credits from that commendation for individual kills) and get 312 cR max as long as the game lasts over fifteen minutes. If I played through the entire campaign, I would get around 3,000 cR from the completition.
I assume that if you haven’t played the campaign alot, you would probably end up with something around 10,000 cR for the entire campaign. It’s really hard to say. Anyway, the difficulty or skulls won’t give you any more credits.
I played Reach campaign from start to finish on Legendary. The answer is: Not many. You can easily get many in the other playlist.
If we asign values to the different credits from the different modes. It would would work like this:
3 - Firefight
2 - MM
.5 - Campaign
Sad but true.
> I’m debateing on wither or not to even play the Campaign in Halo reach, as i am not much of a single player, player. I prefer matchmaking, but if i ever wanted a break from MM, i would like to know how many credits i would earn if i played the Campaign start to finish on, say, Heroic.
> Thanks
If you want to earn the maximum credits, wait until the weekly challenge reads, “Complete 9 mission in the Halo: Reach campaign on Heroic”, or something like that. It has come around twice since Reach released, and it’s the best way to play the campaign with maximum credit payout.
Otherwise, try to go through the levels in the proper order in the Co-op Campaign playlist.