Here I was thinking that I had done something significant by finally going over 50,000 Gamerscore recently. Meanwhile, the Guinness World Record holder for highest Gamerscore has reached a new milestone, surpassing the 600,000 mark.
Raymond Cox, better known by his Gamertag Stallion83, reached exactly 600,000 with the 40-point Homewrecker Achievement in Earth Defense Force: Insect Armageddon, according to his website (via IGN).
His list of games played on Xbox Live is absolutely enormous — he’s played 880 different games, many of them the same game but from different regions. He’s earned 84% of the Achievements across those games for a total of what is, as of this writing, 600,445 Gamerscore.