Here is the full list of all 139 The Walking Dead Collection - there are The Telltale Series achievements worth 4,000 gamerscore.
Complete Chapter 1 of Episode 1 of Season 1
Complete Chapter 2 of Episode 1 of Season 1
Complete Chapter 3 of Episode 1 of Season 1
Complete Chapter 4 of Episode 1 of Season 1
Complete Chapter 5 of Episode 1 of Season 1
Complete Chapter 6 of Episode 1 of Season 1.
Complete Chapter 7 of Episode 1 of Season 1
Complete Episode 1: "A New Day"
Complete Chapter 1 of Episode 2 of Season 1
Complete Chapter 2 of Episode 2 of Season 1
Complete Chapter 3 of Episode 2 of Season 1
Complete Chapter 4 of Episode 2 of Season 1
Complete Chapter 5 of Episode 2 of Season 1
Complete Chapter 6 of Episode 2 of Season 1
Complete Chapter 7 of Episode 2 of Season 1
Complete Episode 2: "Starved For Help"
Complete Chapter 1 of Episode 3 of Season 1
Complete Chapter 2 of Episode 3 of Season 1
Complete Chapter 3 of Episode 3 of Season 1
Complete Chapter 4 of Episode 3 of Season 1
Complete Chapter 5 of Episode 3 of Season 1
Complete Chapter 6 of Episode 3 of Season 1
Complete Chapter 7 of Episode 3 of Season 1
Complete Episode 3: "Long Road Ahead"
Complete Chapter 1 of Episode 4 of Season 1
Complete Chapter 2 of Episode 4 of Season 1
Complete Chapter 3 of Episode 4 of Season 1
Complete Chapter 4 of Episode 4 of Season 1
Complete Chapter 5 of Episode 4 of Season 1
Complete Chapter 6 of Episode 4 of Season 1
Complete Chapter 7 of Episode 4 of Season 1
Complete Episode 4: "Around Every Corner"
Complete Chapter 1 of Episode 5 of Season 1
Complete Chapter 2 of Episode 5 of Season 1
Complete Chapter 3 of Episode 5 of Season 1
Complete Chapter 4 of Episode 5 of Season 1
Complete Chapter 5 of Episode 5 of Season 1
Complete Chapter 6 of Episode 5 of Season 1
Complete Chapter 7 of Episode 5 of Season 1
Complete Episode 5: "No Time Left"
Completed Vince's Chapter.
Completed Wyatt's Chapter.
Completed Russell's Chapter.
Completed Bonnie's Chapter.
Completed Shel's Chapter.
Completed the Epilogue.
Made a decision the only fair way.
Found an old friend.
Arrive at the shore.
Find a campsite.
Meet new people.
Arrive at the cabin
Get what you need.
Take care of yourself.
Head out with the group.
Complete Episode 1: "All That Remains"
Help someone through a difficult time.
Talk to a stranger.
Leave the cabin.
Find a way across the water.
Meet someone on a bridge
Make it to the ski lodge.
Settle things with a new friend.
Complete Episode 2: "A House Divided"
Arrive at your new home.
Witness a murder.
Make it through your first day.
Commit larceny.
Get beaten down.
Invite some friends into the compound.
Give what you got.
Complete Episode 3: "In Harm's Way"
Get separated from the group.
Learn new survival skills.
Return to the meeting place.
Reach the museum.
Find the Observation Deck.
Survive the attack.
Get back on the road.
Complete Episode 4: "Amid the Ruins"
Make it out alive.
Take a breather.
Stop for the night.
Reach the other side.
Make it through to morning.
Reach the terminus.
Find your way through.
Complete Episode 5: "No Going Back"
Complete Chapter 1 of Episode 1 of Season 3
Complete Chapter 2 of Episode 1 of Season 3
Complete Chapter 3 of Episode 1 of Season 3
Complete Chapter 4 of Episode 1 of Season 3
Complete Chapter 5 of Episode 1 of Season 3
Complete Chapter 6 of Episode 1 of Season 3
Complete Chapter 1 of Episode 2 of Season 3
Complete Chapter 2 of Episode 2 of Season 3
Complete Chapter 3 of Episode 2 of Season 3
Complete Chapter 4 of Episode 2 of Season 3
Complete Chapter 5 of Episode 2 of Season 3
Complete Chapter 6 of Episode 2 of Season 3
Complete Chapter 1 of Episode 3 of Season 3
Complete Chapter 2 of Episode 3 of Season 3
Complete Chapter 3 of Episode 3 of Season 3
Complete Chapter 4 of Episode 3 of Season 3
Complete Chapter 5 of Episode 3 of Season 3
Complete Chapter 6 of Episode 3 of Season 3
Complete Chapter 1 of Episode 4 of Season 3
Complete Chapter 2 of Episode 4 of Season 3
Complete Chapter 3 of Episode 4 of Season 3
Complete Chapter 4 of Episode 4 of Season 3
Complete Chapter 5 of Episode 4 of Season 3
Complete Chapter 6 of Episode 4 of Season 3
Complete Chapter 1 of Episode 5 of Season 3
Complete Chapter 2 of Episode 5 of Season 3
Complete Chapter 3 of Episode 5 of Season 3
Complete Chapter 4 of Episode 5 of Season 3
Complete Chapter 5 of Episode 5 of Season 3
Complete Chapter 6 of Episode 5 of Season 3
Complete Chapter 1 of Episode 1 with Michonne
Complete Chapter 2 of Episode 1 with Michonne
Complete Chapter 3 of Episode 1 with Michonne
Complete Chapter 4 of Episode 1 with Michonne
Complete Chapter 5 of Episode 1 with Michonne
Complete Chapter 6 of Episode 1 with Michonne
Complete Episode 1 with Michonne
Complete Chapter 1 of Episode 2 with Michonne
Complete Chapter 2 of Episode 2 with Michonne
Complete Chapter 3 of Episode 2 with Michonne
Complete Chapter 4 of Episode 2 with Michonne
Complete Chapter 5 of Episode 2 with Michonne
Complete Chapter 6 of Episode 2 with Michonne
Complete Episode 2 with Michonne
Complete Chapter 1 of Episode 3 with Michonne
Complete Chapter 2 of Episode 3 with Michonne
Complete Chapter 3 of Episode 3 with Michonne
Complete Chapter 4 of Episode 3 with Michonne
Complete Chapter 5 of Episode 3 with Michonne
Complete Chapter 6 of Episode 3 with Michonne
Complete Episode 3 with Michonne