Call of Duty: Ghosts

Easiest way to get this achievement is at the final fight three ancestors will spawn at certain times when charging the core. Your goal is to not kill any of the ancestors you want to charge the core fully and activate it having the core discharge kill everything that is left on the map.

Each ancestor usually spawns around 20%, 40%, and 60%.

It is fairly easy to survive the entire fight without killing any of the ancestors, use traps around the area to take care of any airborne cryptids while focusing on killing cryptids. you do not have to worry about the core it does not take damage. When it is fully charged all four players must hold X next to it to activate and your achievement will unlock if all three ancestors are alive before doing so.

I found a really easy way to do this. Once the front gate gets broken down you can run through it and hide outside the area. The Ancestors WILL NOT follow you out there so you just have to kill everything else. I'm going to post a video but skip to around 12:40 because that's when I first realized you could run out there. If that's the last gate to open just activate all the traps and kill things until it opens.

This achievement is pretty simple when you use the technique that is shown in the video below. The achievement is to kill all 3 ancestors within 10 seconds of the first one dying. There is a way where you can take all of the ancestors down to the last square of health and then mow them down, but that is more difficult than what I show here.

Solution- The three ancestors will spawn at each other 3 mark off points where the Medusa is getting charged. In the video you can see our movement from back mid to left to center. WE move to make the ancestors out of line of sight so we are less affected by the nova bombs. (I die alot in the middle not doing my job splitting the aliens) We allow all three ancestors alive without trying to touch them as all possible, they do get a little damage from our turrets but not enough to kill the ancestors. Now it is all about survival until you are able to activate the Medusa. IF 3 ANCESTORS ARE ALIVE WHEN GOING TO THE MEDUSA AND ACTIVATING IT the rocket WILL kill all the ancestors will die instantly and POP Timing is Everything!

Gamertag iTs Advocate

Thanks!

This is not a solution to this achievement, but a warning.

If you are going in this order of generators:
1,2 Right side up and down
3,4 Middle (garage)
5,6 Left side (Gas/Petrol station)

When you are in the garage doing the generators there, DO NOT KILL THE ANCESTOR AFTER THE GENERATOR HAS COMPLETED. If you do kill the ancestor after the generator has completed its powering up you will end up glitching the game and you will not be able to trigger the ending with Cross. The dialog will stop and the second ancestor will not spawn at the Gas/Petrol station and you will have wasted your time.

We have done this in three different sessions all experiencing the same problem. Just be careful. If the ancestor dies during the powering up that is fine, but if they are starting to leave you should not kill them.