Score with a first time Sliding Shot

Complete level 'The Father'

Rendez-vous in Fort Santa Monica. (Complete "Brave New World" on any difficulty.)

Save a human from an Abductor's beam

Kill your first enemy in the Call of Duty® Ghosts campaign.

Kill Diablo in Inferno mode.

Complete all the Azmodan triumph challenges.

Kill Maghda in Inferno mode.

Raise the Jeweler to level 10.

Reach level 60.

Kill Diablo in Hell mode.

Equip all Inventory slots with items that have a minimum required level of 25 or higher.

Kill 500 elite (champion, rare, or unique) enemies.