Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
At Journey's End ( 15 points )	Chapter 5: Clear "Face Your Destiny".
Dust Cloud ( 15 points )	Chapter 4: Clear "Into the Fire".
Survivor ( 15 points )	Chapter 1: Clear "On the Home Front".
The Cursed King ( 15 points )	Chapter 3: Clear "Calibos!".
The Edge of the Other World ( 15 points )	Chapter 6: Clear "Scales".
The Fate of Argos ( 15 points )	Chapter 2: Clear "Departures".