Officially the highest GamerScore on Xbox - Imgur

The World Record For Highest Xbox Gamerscore Is Now Two Million

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Achievements on Xbox Live 50k Gamerscore

Xbox Hall of Fame Part 1 - Gamerscore Punch Card - Rack Up 10000 G & Achievements to Earn Points

Highest gamerscore record holder surpasses 600,000 points – Destructoid

How to Hack Your Xbox Gamerscore « Null Byte :: WonderHowTo

1,234,567 Gamerscore, finally got to 7 figures in order : r/xboxone

Xbox - Did you know: Your Gamerscore will automatically carry over from Xbox 360 to Xbox One. How many points have you racked up?

Xbox gamer hits a million achievement points

Gears Tactics has Gone Gold for Xbox Consoles - New Achievements Boost Gamerscore to 1400 - Xbox Wire