The Invincible

To gain this achievement you will need to take the Road to the Landing Zone path earlier in the story

Once you reach the condor head to the top floor to find Rohytra then proceed with the dialogue below:

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'

After the remaining dialogue you will activate the launch control switches, watch the bombs drop and gain this achievement.

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