Here is the full list of all 48 The Walking Dead (Windows) achievements worth 1,000 gamerscore.
Reaped what you sowed.
Separated from your best friend.
Won a game of Rock/Paper/Scissors.
Left someone important in a corn field.
Escaped from the prison bus.
Chose what was best for your younger sister.
Survived Nate.
Found an old friend.
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.
Completed Episode 4: "Around Every Corner"
Awoke to find Clementine gone.
Made a merciful decision regarding someone's fate.
Infiltrated the fallen district.
Returned to the manor with medical assistance.
Discovered the refugees in the sewer.
Searched River Street.
Arrived in Savannah.
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.
Complete Episode 2: "Starved For Help"
Watched Andy die.
Took out Danny and kept his gun.
Chose sides, but was it worth it?
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 1: "A New Day"
Chose between friends.
Finally reunited with your brother.
Met a girl at the end of her rope.
Chose between two sons.
Found help and are now responsible for a little girl.
Escaped from Sandra and met Clementine.
Freed from your cuffs, but...