Unlock Xbox Live Gamerscore points, by completing the following Achievements.

Achievement	How to unlock
Every Herb Bearing Seed ( 20 points )	Complete 'Reefer Madness'.
Forcible Rear Entry ( 20 points )	Enter the Las Palmas stash house via the back door and kill Juan Garcia Cruz.
High Flyer ( 20 points )	Find the flyer at Juan Garcia Cruz's house and proceed straight to the 20th Century Market.
Soup In The Pot ( 20 points )	Open both soup cans in Juan Garcia Cruz's stash room.
Spare A Dime ( 20 points )	Complete the puzzle of the US Morgan silver dollars at Parnell's Soup.