Surviving Mars
80 Achievements
0-1h
Posthuman
Have a Colonist with 2 Rare traits
11.0%
How to unlock the Posthuman achievement in Surviving Mars - Definitive Guide
Project Morpheus and Gurus can help by spreading traits throughout your colony. But, if your colony is large enough and self-sustaining, eventually it will pop. The fastest way to get this achievement seems to be: build a massive colony that's self-sustaining (all wonders + many drones and shuttles) and then just go ham with domes and farms.
I had to manually save my game for both achievements to register, however. So if you do idle, I recommend coming back every few hours to check. Also, remember to plug in your controller, as the game will pause itself if your controller is disconnected.
You’ll most likely get this while going for the S.P.E.C.I.A.L trophy. All Colonists are born with traits, which are further segregated into Perks, Flaws or Quirks. The Rare Traits are the perks known as Celebrity, Genius, Saint. Colonists born on Mars (Martianborn) will develop traits once they reach adulthood. The chances of a Colonist having a rare trait can be boosted by researching the Social technology "Behavioural Melding" (Replaces removed flaws in Sanatorium with random Perks) and breakthrough technologies "Neural Empathy" (Unlocks Rare Trait – Empath) & "Gene Selection" (Doubles the chance that a Colonist will have or gain a Rare Trait).
For this trophy, I suggest periodically reviewing the list of applicants of Colonists on Earth and picking out any Colonist that has 2 out of the above rare traits. This is a little luck based, but you can also boost your chances on the side by constructing Sanatoriums in your Domes, upgrade them with the Behavioural Melding technology, keep birth rates high and keep expanding your population. Eventually one of your Colonists will gain 2 of the rare traits. In my Colony of 2000+ population I had close to 50 Colonists with 2 Rare Traits.