The 400 Days Add-on for The Walking Dead (Xbox 360) has 8 achievements worth 100 gamerscore.
Completed the Epilogue.
Completed Bonnie's Chapter.
Completed Shel's Chapter.
Completed Russell's Chapter.
Found an old friend.
Won a game of Rock/Paper/Scissors.
Completed Wyatt's Chapter.
Completed Vince's Chapter.