Full list of all 48 The Walking Dead achievements worth 600 gamerscore. It takes around 1-2 hours to unlock all of the achievements in the base game.
The base game contains 8 achievements worth 100 Gamerscore, and there are 5 DLC packs containing 40 achievements worth 500 Gamerscore.
Freed from your cuffs, but...
Escaped from Sandra and met Clementine.
Found help and are now responsible for a little girl.
Chose between two sons.
Met a girl at the end of her rope.
Finally reunited with your brother.
Chose between friends.
Completed Episode 1: A New Day.
Chose sides, but was it worth it?
Took out Danny and kept his gun.
Watched Andy die.
Completed Episode 2: "Starved For Help"
Discovered the source of the food.
Had a showdown with a crazy woman.
Reacted to the surprise attack on Katjaa.
Dealt with a stranger caught in a bear trap.
Completed Episode 3: "Long Road Ahead"
Made it out of the train station with precious cargo.
Chose who needed you more.
Provided some tough love.
A friend sets out in search of home.
Left the Motor Inn to the bandits.
Temporarily defused a tense situation.
Chose a stranger's fate.
Made a merciful decision regarding someone's fate.
Awoke to find Clementine gone.
Completed Episode 4: "Around Every Corner"
Arrived in Savannah.
Searched River Street.
Discovered the refugees in the sewer.
Returned to the manor with medical assistance.
Infiltrated the fallen district.
Completed Episode 5: "No Time Left"
Made it out, but…
Confronted a stranger.
Arrived at your destination.
Sacrifices were made.
Broke out of the manor house.
Returned to the attic.
Arrived on the hospital roof.
Found an old friend.
Reaped what you sowed.
Left someone important in a corn field.
Survived Nate.
Chose what was best for your younger sister.
Separated from your best friend.
Won a game of Rock/Paper/Scissors.
Escaped from the prison bus.