Call of Duty: Infinite Warfare

This is a guide done by the cod zombies sub reddit. But i have put some extra tips.
this is not a easy easter egg and the boss fight is very hard i don't recommed doing it with more than 2 people if your team is not expierence, also i recommend tryng to get help from someone with director's cut.
To complete the Main Easter Egg for The Beast From Beyond, simply follow the steps below exactly!
Activate Power, obtain the first Floppy Disk by opening and navigating to Pack-a-Punch. Once there you must enter the Projection Room and wait for the timer to run out. Once the timer has run out a Phantom Cryptid will spawn, kill this Phantom and it will drop a Floppy Disk in the area where you killed it.
Obtain the second Floppy Disk by picking it up off of the ground to the left of the Pack-a-Punch Portal next to a giant power pole.
Obtain the third Floppy Disk by navigating to the Red-lit Hallway near Bang Bangs, Entangling the Floppy Disk behind the bars and shooting it toward the grate in the back. The Floppy Disk can be found in any of the following locations:
-Left of the Magic Wheel in the Hallway
-Up the stairs near the Proteus Wallbuy
-In the Mess Hall
-Left of Magic Wheel in Spawn
-To the left of the door going to the Ops Center from the Hallway
-To the right of the door going into the Cargo Bay
Obtain the fourth and final Floppy Disk by obtaining the Entangler.
To obtain it the Entangler you must star the Skull braker quest.
Use a grenade to open a Fuse Box containing a Skull, locations below. Shoot the Skull inside for
Skull 1
Water Treatment Room above the door to Blue Bolts
Above Bombstoppers
In the Cargo Bay, above the stairs going down from the P-LAW
Skull 2
Navigate to the Cargo Bay and locate small Red Xs on the ground, 4 total will spawn, one for each player. Every player must stand on an X and defend them from Zombies until the Red Skull reaches the ceiling. Once complete you must run and jump off a Catwalk or higher up area and collect the Skull before it disappears (you have 30 seconds), the Entangler will spawn in the center of the Cargo Bay. If failed you must go to the next round and redo the step.
Next Entangle any Space Helmet found around the map, navigating to the Med Bay, and launching the Space Helmet at the Green Monitor in the Forcefield Room. The Forcefield Room will now be opened, the fourth and final Floppy Disk can be found on the tabletop.

use this picture and match the symbol lines to match the Symbols on your 4 Floppy Disks,(Note: if you fail the step the symbols will change and you have to find them match the new symbols ,the disks will be in the same spots were you pick them up), you must use the line that has all 4 of your symbols on it. Once located the order in which you need to insert the Floppy Disks into N31L is listed right to left on the line. Once entered correctly N31L will become Angry, activating Traps and Doors located around the map.
Obtain the Entangler, navigate to the Theater near the Brute Cutout and Entangle the Button on the wall behind. Carry the Button to the 'The Beast From Beyond' Poster in the Theater Arcade to the left of the Cryptid Attack arcade machine. If done correctly the Button will teleport and no longer be on the original wall.
The Button will now be located on the bottom-side of the Desk in the Force-Field Room near Med Bay. Activate it. This will open a 4x4 Grid of Dials in the Med Bay. Note down the initial orientations of each Lever. You must turn each that were initially vertical until all Levers are horizontal. (Note: This method will rarely not work, in this case just write down the current vertical ones and turn them all.)
Upon completion of the Step 4 Puzzle N31L will be temporarily Hacked, you are now on a timer to Entangle his head using the Entangler, take it to the Pack-a-Punch Room, and place N31L's Head in the computer on a desk on the right side of the room. If failed or the N31L Head is dropped, a Nuke will go off, ending the Round, and the Puzzle from Step 4 must be completed again to obtain N31L's Head again. You will be unable to open doors during this so you must follow where N31L's head is pointing until you make it to the exterior. (You can also just wait at the door that you want to go out of but it may take a while and you can become overwhelmed by zombies)
If done correctly, all players are now able to Hold Activate on the Computer to enter the Boss Fight.
Cryptid Battle
Recommended Weapons: Kendall-44, Type-2 (Butcher Epic Variant craftable with 4000 scrap), FHR-40, Mauler (Epic Sentinel Variant Recommended craftable with 4000 scrap), VPR, Venom-Z (side Easter egg, found in the box but only with directors cut)
Now the boss fight (all of this will happen i quick succesion so you have to hear the audio quotes from your character and the ai),(i recommend playing this boss fight in the boss battles game mode so you can get good at it)
The Boss Fight will start with 4 Rhinos spawning in as a laser hits the crate they are located in. Keep in mind that there is an ammo crate in a shipping container in the middle.
The 2nd phase of this fight has you fighting regular scout Cryptids on one side of the room. Kill all the scouts to progress. (Recomend just sataying prone in one of the corners shooting as they spawn)
The 3rd phase will have Phantoms and Scouts spawning on the opposite side of the room. Kill them all to initiate the next phase. (Same as the other step but target the pahntoms first)
The 4th phase will open up all the portals around the room, making Phantom & Scout Cryptids spawn from all sides. During this 2 Rhinos will also spawn. You need to survive until 3 computer terminals light up around the room. Once all 3 are on hold X to turn them off (you need to turn them off in quick succession).
The 5th phase of this fight will open a shipping container containing a larger computer terminal that will start a countdown from 99 seconds (The timer is actually longer than 99 real seconds) . You must survive those "99" seconds with all cryptid types chasing you around the arena. Run around the outside of the arena while keeping the majority of the cryptids behind you, killing only the ones that spawn directly ahead of you. When the 99 seconds are up you must head over to the terminal and hold X.
Lights will dim within the arena and all the remaining Cryptids will die off. Now, 2 Mammoth Cryptids (Blue Rhinos) will spawn. The Mammoths have a ton of health so you must damage them with anything that isn't an explosive or melee. Shooting the Mammoths will cause them to drop a blue fire on the ground which when ran over will deal 1 hit of health to you. Make sure to only shoot them in areas you can route around so you don't block off areas you need to run in. Shooting the Mammoths in the mouth will deal the most damage. (Note. you can insta kill the mammoths by shotting the container with your Mauler sentinel and using the eggo trip fortune card, doing this will give you the final cinematic).
in case you dint insta kill the mammoths keep avoiding the fire, the attacks of the Mammoths, and the random Phantoms/Scouts that spawn while also taking down the Mammoth's massive health bars when you kill the mammoths a cinematic will play.
As soon as the cinematic is over the achievement will take as long as 20 seconds to pop.