Norm (the barbecue guy you meet at the very beginning) will ask you to bring him hotdogs for his barbecue (buy them in the vending machine in one of the houses) . After that he'll ask you to get him information about what happened on the ship.
mCaPP09 has made a list of three quest items you need:
1. The Black Box you acquire after helping Proto for his side mission
2. Captain’s Luggage (on the lifeboat right near the first shortcut. you will have to walk off the side of the ship onto the lifeboat)
3. Strange Memory Chip (by Turner BEFORE you fight CAIN, go down the stairs there will be a passage to the left)
(credit to mCaPP09)
You find the strange memory chip/crystal in the R&D Room (exo line up from Drive-In to Epicenter, then down an exo lift to the R&D Room).
(Sidney will ask you not to tell her husband. Don't listen to her.)
mCaPP09 points in the comments below) that this achievement is missable and has to be done before defeating the final DLC boss. Make sure it's unlocked before you take on CAIN!