Talk to the characters by knifing the door until your character talks, when they do, go upstairs and find the fuse, the fuse is going to be on one of the tables or leaning again the metal cabinet (hard to see). Hold X to pick up the fuse and bring it back to the characters.

After they are done talking again, the generators should be glowing and you have to destoy them, only explosives like the Scavenger and Grenades/semtex's blow the generators up. There are 4 generators located on the map
One is by the characters where the easter egg started
The second one is by double tap off the side of the boat
The third one is behind stamina up
The fourth one is by the bridge from the bottom of the lighthouse to juggarnaught

After all 4 generators are destroyed (not glowing), go back and talk to the characters, and keep knifing until your character talks again. They wan't vodka. of course.
The vodka bottle is in one of the 4 locations:
1.) Upstairs on the stairsteps
2.) Behind the mystery box in the corner right above the characters
3.) On the way to the power
4.) At the seperation of the boats, on the way to juggarnaught from the power room
(look for ice blocks, these won't be visible until you get to this step)

Now you wan't to set the dials, make sure every door is open from top to bottom.
The easiest way to do it is like this: (very confusing, read carefully. hardest part)
Go to yellow (very top), make it 2
Go to blue (2 down) and change it until it makes orange 7 (third floor)
Put purple on 6 (very bottom)
Go to orange, and change it until it makes blue 4
Finally, go change yellow to 2
The dials should now ready 2-7-4-6 from top to bottom.

It's time to activate the radios IN ORDER,
The first one is below the power room
The second one is to the right of the Stamina Up Perk machine
The third one is by the mp-40 (use the zipline from the top of the lighthouse for quick access)
The fourth radio is under the stairs in the room with the characters

Almossst done, Go to the power room, and set the controls
Set the steering wheel two to the right (the wooden one should be facing 5 o'clock)
Push the first level once by holding X
Push the third lever down three times (by pressing X)
(IF DONE CORRECTLY YOU SHOULD HEAR A SUBMARINE COMING OUT OF THE WATER)

Activating the fog horns (IN ORDER)

First one is by the water in front of the lighthouse
Second one is after the slide, take a right
Third one is by the side of PHD flopper building
Fourth one is Down the slide again, but go straight.

Now it's time to obtain the golden rod (last step)

Get the v-r11
Shoot your crawler and allow him to be sucked into the green light
Now the kill the human (he'll get knocked onto his ass)
Suggested ways to kill him: Scavenger, Crossbow, Explosive Dolls, Ray Gun
Once the golden rod drops, hold X on it, and bring it back to where you put the Vodka Bottle, keep knifing the door talking to the characters until they need one more thing. Which is knifing the fuse, after that; they will talk for a couple more seconds then leave, and the wunderwaffe appears.

Congratz on the achievement :p