Call of Duty: Black Ops 2 - Origins Easter Egg

'Secure the Keys (Staffs)'
Step 1 (A): Build all staffs
Step 2 (B): Build ultimate Staffs

'Ascend from Darkness'
Step 2: Place Lightning Staff in the 'Thor' 1000 ft Robot. Place wind in 'Odin', Ice in the 'Freya', then fire in the 5th Holder under PaP

'Rain fire'
Step 3 (A): Take staffs back from Robot head.
Step 3 (B): Acquire Napalm monkey bombs
Step 3 (C): Throw monkey bomb at seal (Near Staminup), and Simultaneously push button in the head of the middle 1000 ft robot.

'Unleash the Horde'
Step 4: 'Unleash the Horde' Send Maxis drone into seal, then kill the 5 Panzer Soldats that come out.

'Skewer the Winged Beast'
Step 5: Go into zombie blood mode and shoot down the red baron (The red plane).
Step 5 (A): Kill the Red Baron zombie in Zombie blood mode, he will be running around the map.

'Wield a fist of Iron'
Step 6: Get all players to acquire Iron fists by hitting Templar zombies with your Sonic blast fist under PaP.

'Raise Hell'
Step 7: Place Ultimate staffs back in the Crazy place, then kill zombies by them

'Freedom'
Step 8: Achievement get: 'Little lost Girl'

Here is a video tutorial: