Once you have completed Darwinia+ and got
The Savior achievement in Darwinia+ worth 48 pointsComplete the Single Player Campaign
a new location on the map will be unlocked called Launch Pad.
Simply visit the location and complete the mission to unlock this achievement.
For the sake of spoilers I won't include a walkthrough, but be assured: if you've made it this far, you shouldn't have any difficulty with it.