Story related, can't be missed.
Episode: 4
Scenario: #1 - Trust Issues
You'll get this after talking to Yoder for a while. There is no specific route you must take in your dialogue.
Important: After the dialogue, you must get Gerry a flare for an achievement later called "Zero Blind Mice". Switch to him and look above on the locker. Grab the flares. Do this before leaving which is dialogue based.
I do not own, or pretend to own any information above. Any information posted above by me is to be used only to help this community and for no other purpose. The original information can be found here: http://tinyurl.com/JPcheevo Any questions please feel free to send me a pm, I am glad to help in any way that I can.