The Invincible

To gain this achievement you will need to take the Road to the Landing Zone path earlier in the story. Do not take the path to the alliance base.

For this achievement you will first need to follow the peacemaker dialogue below and also after completing this achievement you should be able to reload your save and do this part again to work on the Innate Curiosity achievement.

Head to the condor at the end of the game and go to Rohytra.
At the bridge go through all the dialogue with Rohytra selecting whichever you want, ideally being against the bombs until you come to the Necroevolution theory. DO NOT choose 'There's no point speculating' instead select 'Necroevolution theory [discussion]'.
Then shortly after select 'In short? This is how evolution works'.
Now when Novik asks if you agree about them being invincible select 'I fully agree. We shouldn't attack'.
Rohytra will ask what else we can do if not attack, select 'Evacuate from here'

Rohytra will be done with one press of a button left, but he won't be able to do it and will stand down. You should now move into the hibernation chambers to get this achievement done.

When in the hibernation chambers speak with Rohytra and he will ask you if you're still wondering if you should go to the nest, be sure to select 'No I'll stay here' and a few days later you will be looking out the window and you will eventually see The Invincible arrive. Click the Invincible as it comes in to land to gain this achievement.

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