Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Long Time Ago (10 points)	Complete the Prologue.
An Old Internet Meme (40 points)	Renovate all the Social Clubs and complete all the Social Club missions.
From the Past (30 points)	Unlock the Medieval Armor in the Café Théâtre.
I Got Skills (20 points)	Unlock all Skills.
Must've Left it Open (10 points)	Lockpick 5 doors.