Out of Mind

The late-game project: build Al-An a new body. He'll direct you to three Architect caches for the components - tissues, skeleton and organs - each buried in one of the deep biomes, then it all comes together at the Fabricator Base in the Crystal Caves region. Fabricate the vessel and your passenger finally checks out of your head - achievement pops at the hand-over. The finale (Into the Unknown) follows straight on.