I have now slogged out the campaign on veteran and have tried to replay the levels to complete the challenges. The actual game play in the campaign is so minimal its very disappointing and fricken irritating. On the Odysseys level there is actually 90seconds of game play to about 10min of cut scene. It like the developers have created a 2h game and filled it with 8h of cut scene. I'll walk away get a drink and come back to the cut scene still running. I have given up with the challenges and I tried zombies. Zombies just feel unfinished and out of place. I've enjoyed the multi-player so far and I enjoy the weapon customization for the campaign. In general I think this game is a bit of a lit down.

Thanks, I knew I was missing something.

Has anyone notices the ledge, on the left side when facing chasm, just after the room when you get the death grip. I have tried back jumping from the lower ledge, jumping from the high edge on the opposite side, and can't find anything to interact with to access this ledge. Dose Death get some kind of double jump later in the game?