This is your first formal campaign objective. You will find the data piece on the first derelict you board. Take it slow, don't go under 0 energy, be conservative in your fights (but take as many fights as possible, you need the creds). Keep in mind that it will take several runs to fully explore and clear out each derelict; don't be afraid to return home if you're getting beat up.
Eventually you will find the room with the data piece, and you'll need to complete an additional side quest to actually get it. Once all this is done, evac and speak to the governor back at base to unlock the cheevo.