The Walking Dead: The Telltale Definitive Series

This is story related and cannot be missed.

This episode was added onto Season 1 as DLC called '400 Days'. In it, you play as five different characters, each with their own story but seemingly linked together. Play through each character's chapter in any order and however you want and when you’re done with each, you'll be back at a bulletin board to select the next character.

Once you have completed the five individual chapters, the epilogue starts automatically with Tavia talking with someone on the walkie talkie about survivors. She decides to locate the survivors and persuade them to join a safe community. The dialogue choices you make will determine who goes with you. The achievement will unlock as the episode results are shown on screen.

Note that in previous releases, this episode had two missable achievements. In this release, the choices you make during these events have no bearing on the achievements.