While there is an option to import choices from Seasons 1 and 2, because of an error I was not able to so I was forced to create a new backstory. What differences this will make for people reading these solutions, I can't say. None of the achievements are missable and you'll get them anyway, but your experience may differ somewhat from mine. I'll keep these solutions as general as possible to account for that.
Javi awakes in a truck with his hands tied. After a couple of dialogue choices, it crashes (in true TWD fashion) and Javi escapes with a gun. You're presented with a major decision: whether or not to shoot the driver. I chose to hold my fire, which resulted in his escape...
You're soon presented with another major choice (to give away the van or not) but your answer doesn't seem to matter. Either way, the chapter ends after a few dialogue choices.