DEAD RISING 

Free Mode Glitch

This glitch allows you have a full free 72 hours game time to complete achievements, without having to do the main missions. You can easily unlock the Zombie Genocide Achievement, by driving over zombies in the Maintenance Tunnels, without having to worry about running to do missions. 

Start a new game as normal until you reach the warehouse. Either walk forward, if you have taken the lift, or drop down from the shelves if you have entered through the top door. Walk towards the exit that leads to the mall and STOP. Do not enter the hallway. Just stay there and wait until 7pm  game time. 

After 7pm you will get the Queen Insect cut-scene, which isn’t meant to happen until near the end of the game. After the cut-scene, you can enter the hallway. The cut-scene which normally happens when you walk through the hallway, where Jessie asks you to find Brad, will not be activated. Since the first mission is not activated, none of the other main missions will be activated. You are now free to enter the mall and wreck havoc to unlock achievements.

Outdoorsman Achievement Glitch

Indoorsman   -  20 points

TYPE: 1 Play REQ: Spend at least 24 hours indoors.

Outdoorsman  -  20 points

TYPE: 1 Play REQ: Spend at least 24 hours outdoors.

Here’s an achievement you can earn just by turning on the Xbox ! This achievement requires you to spend at least 24 hours outdoors. But here’s a real easy way to complete this. You first need to complete the Indoorsman Achievement, which isn’t hard at all. You need to stay indoor for 24 hours (2 hours REAL TIME)  without going outdoor at all. The easiest way is to stay in a Save Room for the whole time, and you have to be in a Save Room at the end, for the glitch to occur.

As soon as the Indoorsman Achievement pops, SAVE your game and turn off your Xbox. Turn your Xbox back on again and reload the game. Wait around in the Save Room for a couple of minutes and the Outdoorsman Achievement will unlock.