I order to get this achievement, you need to land two Alliance probes in the alliance base.
- During your first visit, look for the probe control console, which is in the central module, rotate the dial to the third (central) position, and then click on the small screen on top of it. Now you can fly the probe number three. Land it on the marked spot.
- During your second visit, go back to the console and rotate the dial to the second position, and follow the same procedure for the second probe. The landing point is a bit further than the first one.
The achievement should click after you land this second probe.