The Invincible

To achieve this ending you must choose a certain choice about middle of the story.



Hope this helps, enjoy the game!

This achievement is only available if you took the Road to the Landing Zone path where you witnessed the hopper crash

You might also gain The Violent Solution ending with this one.

Head to the top of condor towards the end of the game and begin the dialogue with Rohytra:
At the bridge go through all the dialogue with Rohytra selecting whichever you want, ideally being in agreement with the bombs until you come to the Necroevolution theory. DO NOT choose the 'Necroevolution theory [discussion]', instead select 'There's no point speculating'.
Now when Novik asks if you agree about them being invincible select 'There is a chance of success, but it's small.'
Rohytra will then ask if it's worth trying with smaller charges, select 'It won't hurt to try'.

If you need more help with this you can follow my video guide below which will start at this achievement: