Damnation

This will unlock once you complete Campaign mode on at least Hardcore difficulty. As difficulty stacks you will unlock this if you complete the game on Insane Difficulty and will also unlock in both Co-op and Solo mode. Each level of the game is not particularly hard, just time consuming as they are very long. Here are a few general gameplay tips to help you through each mission:

• Though there is no button to back up against cover, retreat often to gather back any lost energy.
• When trying to work out where to go next, use spirit vision to locate your comrades. If the enemies have been cleared out, then they will proceed to the next checkpoint and show you where you need to be.
• When using vehicles, stay on the gas. There's no benefit in trying to round up attackers so just storm past them and continue to your next checkpoint.
• When dealing with snipers, allow your A.I comrades to draw their fire thus allowing you to get a good lock on them to blast them to pieces.
• Like almost all other shooters, headshots are critical. Conserve ammo and take out enemies faster by always aiming for the head.
• Remember that you can always back out at any time and activate the cheat which unlocks the super weapon, it is a one shot kill on all enemies and you will restart at your last checkpoint and there's absolutely no penalty for doing so.