Rather easy achievement, this. All you need to do to get it is to modify a ship, which can be done by visiting a Ship Services Technician, who are available at not only every major city, but most major settlements too.

The Ship Services Technician is usually found near the space port, whether stood by the Trade Authority kiosk in New Atlantis, or in his own little hut near the Akila City main gates on Akila. There’s one in most large places, you might just need to look for them. And like I said, they’re not just at major cities, but major settlements too: for instance, both Gagarin Landing on Gagarin in Alpha Centauri and the Red Mile on Porrima III in Porrima have one too.

Once you’ve found one, approach them, and say “I’d like to view and modify my ships,” and then, in the next screen, hit to open up the Ship Builder, where you can add and subtract parts to/from your ship. Make a change, save it, and get this achievement - you may as well add more storage, as it always helps.