Complete game on "Walk on the Beach" difficulty.

The end of the line.

Blow up 10 explosive objects, killing at least one enemy each time. (campaign only)

In Buried, survive an entire round within the maze on round 20 or higher.

In Buried, Pack-a-Punch a weapon during round 1 with no one using the bank or Weapon Locker.

In Buried, drop the beat on 10 zombies in one game.

In Buried, acquire a perk for free.

In Buried, rewrite history.

Stand united.

Kill 50 enemies with grenades. (campaign only)

Hit 10 enemies with your melee attack. (campaign only)

Kill 75 enemies with any shotgun. (campaign only)

Play it loose.