This achievement requires you finished 3 side quests and can be missed.
Quest 1 : you will have to find and activate Terminals between Aria's bunker and Talon HQ. You will have to take the quest from the Hacker at Aria's bunker before talking to Aria and progressing the story. You do not have to turn in this quest. Look for the red and bold indications in the walkthrough for all Terminals.
Quest 2 : you will have to find a Kehri Inverter and give it back to the Mechanic. You will have to accept this quest from him first at Aria's bunker the first time you get there, find the piece at Talon HQ (on the left on the ground when you're free to move) and bring it to him. Look for the red and bold indications in the walkthrough for a more accurate position of the item.
Quest 3 : you will have to find Aria's couch, yes, a real couch, for Harrot the merchant, the second time you come to Aria's bunker. This quest isn't available the first time around. The couch is located under water, before Central Support, after activating the Dam Controls. Take the ladder down, and examine the couch. Aria will comment on it. Look for the red and bold indications in the walkthrough for a more accurate location.