you have probably heard there is an upgraded tomahawk in Mob Of The Dead and your probably wondering how to get it. This post shows you in the below video how to get it and the steps required to finally pick up the tomahawk which has to be done in afterlife mode.
So far from what I have seen and the guy in the video also mentions that only one person can only have the upgraded tomahawk in a two player game, I have not tried it in 4 player so it may be different, however you guys can be my eyes and ears who play 4 player and let me know :).
To get the tomahawk you basically need to go to the Golden Gate Bridge via the plane with the original tomahawk equipped, then you need to finish a round or do a whole round on the bridge only using the tomahawk to finish off the remaining zombies.
You then go back to the prison through the electric chairs once the round is over, go to where the first dog is in the Michigan Area and the B32R automatic pistol is on the wall. You look down where the zombies climb up from underneath the platform and you will see a lava pit. You throw your tomahawk into the lava, then run down to the showers and electrocute yourself into after life. The go back to where the original tomahawk is located, in the room with the 3 dog heads above the wall, and pick up the tomahawk which has now turned a blue colour.
Go back and revive yourself and when you throw the new tomahawk it will be a blue colour making it slightly more powerful than the red tomahawk. You now have the "Hell's Redeemer" tomahawk upgrade. Check out the video below if your unsure how to do this: