So, I created another Warlock and I have played through every mission and for some reason Mars has not unlocked. Every mission in the campaign has been completed. This is ridiculous. Bungie needs to stop worrying about the fact that it's members have out smarted them and found sooooooooooo many ways around the game and fix the damn game and make it playable. Seriously, so what if we can knock Atheon off. What matters is whether or not the servers are running and stupid crap like this doesn't happen.
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So you did the first mission on Venus went to the reef finished up Venus. Did you remember guy who hates your guts telling you to bring him the eye of a gate lord and have a nice death? Well he still wants it even if you didn't die (or stay dead). Try visiting the reef. If you've done that already then there's something wrong with your game. Just remember you visit the reef twice in the storyline. Beginning and end of Venus.