Officially the highest GamerScore on Xbox - Imgur

Your platinum / 1000 gamerscore / 100% Steam achievement collections, Page 13

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

Sea of Thieves - From the XBOX player with 600+ Arena wins.

The Most Gamerscore in One Achievement

The Journey to 1 Million Gamerscore is Complete! - The 1,000,000+ Club

The Gamerscore League Hall of Fame - Gamerscore League

RedmptionDenied's TrueAchievements Blog

Apparently 75% of Xbox owners play less than 150 hours a year. Looks like most people aren't getting their moneys worth out of gamepass : r/XboxSeriesS

Xbox User smrnov Becomes First Player To Hit 2.5 Million Gamerscore

Xbox achievements: the good, the bad, and the ugly

Xbox 360 Live Achievement Highest Gamerscore In The World

Achievement – Minecraft Wiki

Xbox player achieves 1 million Gamerscore

Xbox Game Studios + Bethesda + ABK, OTXVIII, Some Marketers Are Always Trying To Ice Skate Uphill OT, Page 15