Please stop messaging me for help on this achievement. If I could I would like to help every single one of you but there is no way I can help anywhere near the amount of people that have messaged me for help. This achievement takes 3-5 hour sessions, I simply just can't help people with it, I'm sorry. This also isn't exactly an achievement that you can be carried through, every single person in the game has to know what they're doing. Just one person can ruin an entire run for the whole group. I created this guide to try and help others as much as I could. If you're not good at dead ops, try to recreate the glitch I describe below. Other than this guide I can't help you and I will be ignoring any messaging asking me for help with this, sorry and good luck everyone.
Not necessarily a round to round guide as the achievement is pretty straight forward. All you have to do is make it past round 64 on Dead Ops Arcade, HOWEVER this is without a doubt one of the hardest achievements in Call of Duty history. I personally did not get this achievement legit, I encountered a invincibility glitch and will try my best to explain how it was done, then give tips for those who can not recreate the glitch or want to go for it legit.
Starting off with the invincibility glitch that helped my group and I successfully cheese this achievement, it is not 100% as I was only able to recreate this twice out of about ten tries. Around wave 28 I believe, you have a chance of coming across a bonus room that gives you two tanks, two helicopters, two of the mechs, and a couple of nukes. I do not know if this will work for everyone as I got to this bonus room multiple times with about 20 different people and I seem to be the only one that ever experienced it, it may be a glitch with the download of my game or something, I am not too sure what exactly it is as no one else in my game ever experienced it. However, when you grab a tank, if you PUSH THE LEFT STICK FORWARD AND HOLD IT AS YOU LEAVE THE BONUS ROOM IN A TANK
(throughout the black loading screen as well) there is a chance that the game will glitch and cause you to fall out of the map. If you fall out of the map into a gray screen where you begin falling infinitely, the game will eventually spawn you back up top with everyone else (outside of your tank) and you will now have invincibility for the remainder of the game. As I said however, this is not 100%. Every time I made it to this bonus room, my game would glitch me out and make me fall through the map. Sometimes I would fall under the map, where zombies would continue to spawn without the game giving me the invincibility, while other times it would spawn me outside the map's barrier inside the zombies spawn where I would essentially just get destroyed by zombies and lose all of my lives because I was unable to reenter the map. THE INVINCIBILITY ONLY HAPPENED when I successfully fell into the infinite gray screen and the game force spawned me back up top outside of the tank.
IN SHORT, if you come across a bonus room that includes the tanks, helicopters, and mechs, grab a tank and hold forward on the left stick as you leave the room. If you're lucky, this will cause you to fall out of the map into an infinite gray, in which you should respawn up top with invincibility.***IF YOU COME ACROSS THIS INVINCIBILITY GLITCH DO NOT PICK UP ANY TANKS, HELICOPTERS, OR MECHS FOR THE REST OF THE GAME!!!!!***
You should be fine picking up any lives, power ups, guns, pack a punch, first persons etc. but DO NOT pick up tanks, helicopters, or mechs for the remainder of the game if you get the invincibility to successfully work as you will lose it when the vehicle power ups run out. If you become invincible, just stand towards the edge of a map away from where any power ups might drop. The first time I encountered this glitch, a helicopter spawned in front of me and I lost the invincibility when it ran out. Just stand near zombie spawns to keep as many zombies away from your teammates as possible.
And that's pretty much it, just slowly make your way through the remaining rounds. Again, you have to complete 64 rounds. At round 64 when the momaback spawns, the person with invincibility should get her attention, while the other players shoot her in the back. As soon as zombies get close to any of the others players, drop a nuke, giving everyone else a couple seconds to continuously spray into the momaback. If you take turns dropping nukes and do it correctly, it is also possible to complete and unlock the multiplayer playercard for defeating the momaback without dying as well.TIPS FOR THOSE THAT WANT TIPS ON DOING THIS ACHIEVEMENT WITHOUT GLITCHING
First of all, do not go for this achievement with randoms or people that are not very good at Dead Ops, it will not be possible. If you can't make it to at least round 40 solo, you probably aren't good enough to go for this achievement in a four player game as this game mode is really tough to beat. You need to communicate and actually share drops. Also only start if you have a solid 3-5 hours. If you're lucky, you can beat it in just over three hours but it will probably take most up towards five hours.
DO NOT BE GREEDY
One of the biggest advantages is getting a high multiplier, which you get by simply surviving and not going down. If someone has a 3x multiplier or higher, and everyone else is at 1x, let the 3x person grab all gem drops. This will allow them to build up lives (you get one life every 200k points) in which they can give to the rest of the team when and if they go down. Whenever you come across bonus rooms, do not grab all power ups, actually share them. Not only will you irritate everyone in your party if you grab everything, it will physically make the game harder if only one person actually gets power ups. One tip for bonus rooms that include guns, let one person grab guns at a time. Each person should grab two of any guns, then ONLY ONE death machine, which is always in the back left corner. Grabbing two guns, then a death machine will give you the third tier death machine which absolutely melts through zombies and is without a doubt the best gun in the game. Doing this will allow all four players to get the upgraded death machine for the next round. Also as a side note, you can only hold 9 of each item and lives at once. If you're at 9 lives and about to hit your next 200k point mark, let others go for gems to prevent you from wasting a life.
AFTER BEING REVIVED
Once you go down, it will last a few seconds if you have a life or a minute if you have none (or 30 seconds with the revive fate). When you get back up however, you receive a short shield around you that kills all zombies you touch and lasts for about 30 seconds. USE THIS TO YOUR ADVANTAGE by running into large groups of zombies as you get up. It will make clearing large groups of zombies very easy.
GET MORE LIVES BY LEAVING AND REJOINING A PRIVATE GAME
If you are playing this with a group of friends, make sure you make it a private match, as this will allow players to join and leave the game when needed. When rejoining a game, the game will make the player sit out the current round before spawning them back in with 3 lives in the next one. You can use this to your advantage if someone has lost all of their lives. Before starting the next round, simply have that person leave the game and rejoin. I strongly recommend only doing this on rounds in which you have to teleport to the next area however because waiting in non-teleporter rooms has a chance to spawn the mamaback, which will kill and waste your lives. If she does spawn, do not try to kill her as you can't, just exit to the next area.
USE NUKES EFFECTIVELY
This is why a good team with communication is needed. Dropping two nukes on top of each other won't be much of a problem early game, but it could for sure cause problems if you accidentally do this late game. Come up with some player order to drop nukes or clearly call when you are about to drop one. Also if a player has more than one nuke, have them drop theirs last and try to save up more if possible. If you have only one nuke, don't be afraid of dropping it to end rounds earlier or to get out of bad situations because the start of every round gives you one nuke and speed boost if you end the previous round with 0.
The second time you enter the Wild after round 20, you will climb up a volcano before coming to a mini boss fight at the very top. He may seem tough at first, but he really isn't. You just have to keep your distance, like a lot of distance, try to keep him at the edge of your screen because he can lunge across the screen and strike you. After defeating him you will fall into a room from the top of the volcano that gives you fates, which are essentially bonuses that will last for the remainder of the game. The two best fates are hands down the infinite death machine and fast boots. If two players do not get these fates, it might be worth restarting because the others really are not worth it in my opinion. This will also give all players the Forever Fated achievement if you have not received it yet.
THE WILD EXPLORATION AND GETTING FATES EARLY
It is also worth noting that it is possible to get these fates earlier by simply continuing exploration in the wild the first time you enter, rather than leaving at the first portal you see. All you need is two keys, one is found during round 1 on the beach and another one has a chance of spawning within the dungeon on the left side of the wild, right next to one of the zombies head spawners. Simply enter the dungeon and see if it spawns in the first room, if not leave and check the bonus room on the right side of the wild's first section. Keys can also sometimes spawn within the trees of the wild. If you do not get two keys, you may want to restart the game to save time. If you are successful in finding two keys, continue up the right side of the map past the bonus room. I won't type out the entire guide of the Wild as it is a lot of stuff to know, but successfully passing the wild at this point will allow you to reach the volcano early and get your fates by round 5, rather than 20. I would highly suggest doing this for it can help speed through early rounds. And again, if you do not receive the boots and/or death machine from the fates, I'd highly suggest just started over to save time. For a really good video explaining how to do this, here is TheMoZProject's excellent guide on youtube, his video is far better than any text guide I could possibly put together for the wild.
I would also highly suggest watching as many of The MoZProject's videos as possible, the link to his channel ishttps://www.youtube.com/user/TheMoZProject/videos
He uploads many videos of solo, double, triple, and quad playthroughs of Dead Ops Arcade as well as very useful hints and guide videos for various zombie related tasks. You will learn a lot just by watching the type of moves him and his friends make.
This is pretty much all the info I can give for making this achievement easier. If anyone has big hints or tips that I've missed, leave a comment and I will try to update this guide with that info. Good luck for those trying to recreate the invincibility glitch I stumbled upon and godspeed to those soldiers trying to do this legit.