To Able To Go For This Achievement, You Must Get This One First:
You Can Filter Traits For Colonists That Can Live In A Dome
- Biorobot Colonists Have The Biorobot Trait, So "Thumbs Up" It For One Dome And "Thumbs Down" It In All Your Other Ones.
- Traits Can Be Assigned To Domes From The UI That Pops Up, After You Click On A Dome.
This Forces Them All To Live In The Same Dome, And Keeps Other People From Migrating There.
Achievement Pops When 50 Of Them Are All Built And Living There.
Good Luck!