Seeing as no one has started or been able to explain how to do the easter egg on moon as a thread, i thought i would be the one to do so. I'll do it in a steps and explain as much as possible without confusing people and welcome any and all questions relating.
I will explain the first part of the easter egg in detail then it will be followed by the second part for the secret achievement.
WARNING - The secret achievement can only be obtain if the player starting as richtofen has done and completed the Call of the Dead and Shangri-la Easter Eggs.
Step 1 - Samantha says - Once the power has been turned on, make a crawler and head the first outside space area (second area you encounter after teleportation), there you will encounter a computer terminal with four screens. Each screen will have an individual colour which will be shown at the start from left to right then to left. afterwards, it will show 1 colour on all four screens, enter the correct colours as if you were playing simon. it should be around 5-6 colour you need to enter. when it flashes green continously, you have completed the step.
Step 2, Go up the stairs after the power room (labs) and collect the hacking device. in the middle section of that area, before the two sets of turning stairs, you will encounter 4 buttons to the left hand side before the stairs, for 500 points hack the far left button. Afterwards, there will be 4 green lights in the 3 floors of laboratories that you have to hack, THIS IS TIMELIMITED. the 4 green lights are at random devices that have numbers on them like an electronic dial. Just hack the 4 of them with green light.
Once that is completed, return to the 4 buttons, and from right to left press the action button on each one.
The step is complete when all four buttons have lightend up and are flashing in different colours.
The next step is a matter of patience, it is also the once most people have complications as it may have been hacked into early or the tannoy does not even mention till late in the game. Pray it says it after you have done steps 1 & 2
Step 3 - You must ALLOW tunnel 6 to become decompressed, this may take a while for the tannoy to say so you may have to continue playing until it says tunnel 6, once the alert has been made that it has been breached, go through the OTHER side back to the starting area (in space, not earth) and hack the terminal to release the excavator from tunnel 6
*Do not go to the starting area via tunnel 6 or the excavator will kill you
Step 4 - Go to tunnel 6 and by the m16, there should be the ball from the shangri-la easter egg, knife it and FOLLOW it, it will get trapped in various locations so just knife it again to move it and/or open the doors for it. when it gets outside, it will go to the antenna on top of the starting area, you must shoot it with a wave gun to get it moving, it will then come down and go via the opposite side till it eventually gets to the pyramid by the power room.
If it is not fully in the center of the circle, use a QED grenade to push it in
QED is the special grenade that creates a shockwave, if that doesnt work, make sure you have done step 2 properly.
*Be sure to follow it or else it will get trapped somewhere and you may end up losing it.
Step 5 - A Canister will appear from a corner of the pyramid, you must feed it 25 zombie souls, kill 25 zombies near the pyramid to complete the step
Step 6 - There is a switch next to the pyramid to the left hand side from the steps, activate it and the pyramid will open to reveal an interesting character from the zombies story
Easter Egg - Cryogenic Slumber Party Completed
For the Secret Achievement
Step 7 - Return to Earth and when teleported, if you look to your right hand side, you will see shelves with plates on them, you want to throw a frag or semtex to knock them both down and then throw a girsch device to teleport them to the teleporter. Once you are all back to space, the plates should be with you next to quick revive, use a QED nade on them and they will move to a computer on the diagonally from you position.
Note-Both plates must be knocked down in order for them to be teleported.
Step 8 - Go to the laboratories and you will encounter a cable by some barrels in an S shape, (they may be in another location, but what seems to be from others it is usually in the same place of the laboratories). Take that cable to the plates and place it between the computer and the plates to link it. Afterwards, get Richtofen to place the goldenrod in between the plates and access the computer by continuously pressing the action button. Listen to the dialogue and process and then continue to step 9
Step 9 - Go to the pyramid and fill the 4 canisters just like step 5 but as it is 4 canisters, you need 4x the kills (for those bad a maths, it = 100) Once you have done the 100 kills, get richtofen to place the goldenrod in the circle and now just listen to the dialogue
Gamer Picture Recieved
Step 10 - Go to the terminals and do samantha says again, but this time its three times, so slightly harder.
Last Step - 11 - return to the pyramid and use a QED device on the ball that is currently out of position, it will shockwave it and return back to the samantha says terminals, use a girsh device to teleport it back to the pyramid and then enjoy the 30 minute show
Secret Achievement complete
2nd Gamer Picture recieved
Easter Eggs Completed
Hope this helps most of you, And for the 90% that got here via google-ing the easter egg, join this forum! Real helpful Site!
If you are already a member, and found it helpful, thank the post so i know it's of use to someone