The Aftermath Campaign in Gears of War: Judgement on the Xbox 360 is a bonus campaign you can unlock which takes place after the Gears of War 3 story.
To unlock the Aftermath Campaign, you’ll need to get a total of 40 stars or more in the regular campaign.
Completing the Aftermath Campaign will unlock the Paduth character to use in multiplayer as well.
Check out my other guides for unlockable multiplayer characters, unlockable weapon skins, unlockable character skins, or a complete list of cheats, unlockables, tips, guides, and more in Gears of War: Judgement.
Don’t forget that if you really want an exclusive character and you didn’t pre-order the game, or if you pre-ordered it at a different store, you can always check out the Gears of War: Judgement DLC on Ebay.