The Walking Dead: The Telltale Definitive Series

This is story related and cannot be missed.

After Lee and Kenny return from a supply run, while Lee is investigating stolen supplies, bandits attack the motel camp. While they are being fended off, walkers break into camp, forcing the group to flee in an RV. As you are traveling, Lilly accuses Ben of stealing the supplies so it's up to you to mediate the situation. You learn shortly after that Kenny’s son Duck was bitten.

Traveling farther, the group stops at a railroad crossing with a train blocking the road. Taking some time to get it rail-worthy, there is a lot of dialogue for the next couple of chapters. After a while, Kenny stops the train because there is a tanker hanging off an overpass which is blocking the tracks. Upon meeting two new survivors, Omid and Christa, they agree to help the group clear the way for the train, and not a moment to soon as the group is about to be overrun by a herd of walkers.

Later on, as you approach Savannah, Kenny will return to the engine cab where Clementine is sleeping. He and Lee will talk about plans when they reach the city. Then they both hear a voice on Clem's walkie talkie. And with that, the episode ends, unlocking this achievement.