Complete the following achievements to unlock Microsoft Gamerscore points.

Achievement	How to unlock	Points
4.50 from California	Start your adventure on the Marine Express.	90
And Then There Were Three	Find the body of Ms. Marble in her room.	90
Appointment with the Toilet	Painfully observe Astrid's failure to hold on.	90
Crooked Truth	Give answers to your peers.	90
Hope Under the Sun	Read the Epilogue.	100
Murder on the Marine Express	Complete Chapter 1.	90
Pigeon Among the Cats	Complete Chapter 3.	90
The Murder of Lawrence Sheppard	Complete the game.	90
They Did It Before the Mirrors	Complete Chapter 2.	90
Time for the Prosecution	Complete Chapter 4.	90
Two Blind Mice	Meet Christine outside of Sheppard's room.	90