"Have every system and subsystem installed on the Kestrel Cruiser at one time."
The Kestrel Cruiser is only missing three systems that need to be bought to earn this achievement: The Teleporter, Drone Control, and Cloaking. These systems cost 75, 80, and 150 scrap respectively, for a total of 305 scrap. Stores commonly sell these throughout the game, so there is little need to rush and buy them early.