This achievement is story-related.
Back in the lab, you need to search for clues, again. Check the Data File next to the Husk Experiment, then the Microscope, and the Project Information in the other room. Finally, check the messages upstairs.
You can then go away, or search for 2 more clues. Do so.
Check the Sovereign Fragment again, the Datapad, the Scope, the Stone Paintings near the bathroom, the Creature Sightings, the PDA, the Computer Console TWICE, and the Icarus will appear on-screen. Check it and unlock your first clue (1/2), then the Prothean Artifact again in the other room, and finally the Blackout Crimes.
Go back outside behind the tree for another Pistol Ultralight Materials mod, and another Pistol Cranial Trauma System mod near your shuttle. Get back in, then check the Drawer left of the Husk head, and unlock the Locker. Jackpot. You will get an Assault Rifle Omni-Blade upgrade and the second clue. Activate both clues on the map, and you get your next destination.
When you get there, it seems ecctic at first, but it’s just shaking a lot. You have all your time and only weak enemies to dispatch until you reach the AT-12 Raider Shotgun on the floor next to a dead body (when your temmates say you have to find another path). In the next room, you have a SMG High-Velocity Barrel mod on the ground. Go up and activate the bridge, preparing for a Banshee.
After moving on, you’ll have to enter a building. There is a SMG Mass Pulse Recoil System mod here. Continue and during the next fight is some Data to salvage for 2500 creds. Upstairs, it’s just a lone Cannibal, a Medkit and some grenades. Moving on. There is nothing for a good long while except fighting, then you’ll encounter a Harvester. When it’s gone, in the next building is your second Assault Rifle Omni-Blade augment. Next to it is some easy to miss Machinery to salvage for 2500 creds before moving on.
When you reach the elevator, there is worth 5000 creds of Data to salvage inside the structure, on the left. There also is a Medkit. Ride the elevator and meet Ann Bryson. There is only 2500 creds to salvage on the other side of the next massive fight with the Harvester. Enemies don’t respawn here, so you can kill everything and go get the creds. Then go for Cortez. The achievement will unlock here.