This is an incredibly easy and straightforward delivery quest, but I wanted to add a guide to address a glitching issue with it.
The quest is called Don't shoot the messenger. You receive this quest by picking up an ECHO recorder in Tycho's Ribs.
Head to the Triton Flats area and go to the objective point. Once there you will have to kill a bunch of Scavs. When they are all dead your objective will be to talk to Hannah.
This is the part that glitched for me. If she is not laying on the ground immediately in front of the derailed train; save and quit. Load back up your profile and go to the objective again. She should be there.
Once you speak with Hannah, she gives you an ECHO and you simply need to take it Moxxi's bar in Concordia. After a brief conversation your quest is over and you receive your trophy.