The Brain Drain trophy in Borderlands: The Pre-Sequel is story-related and can't be missed.
You will unlock the trophy after completing the game's ninth story mission "Science and Violence".
*** Spoiler - click to reveal ***- Retrieve scientists: 0 / 3
- Find first colleague
- Go to observation area 11-B
- Find family photo
- Return to Doctor Langois
- Return family photo
- Find second colleague
- Drain aquarium
- Open aquarium door
- Grab teddy bear
- Return teddy bear
- Find last colleague
- Find keycard
- Unlock door
- Return to Doctor Grayson
- Take cloaking device
- Return to Jack's office
- Talk to Jack
- Give Jack cloaking device
- Lock door