A quick and easy way to check if an Xbox Live gamertag is taken or already registered. The online Gamertag Checker tool. Is there a place that I can type in someones gamertag to see what theyve been playing/what achievements theyve got?. Find out how to manage and update your Xbox gamertag and profile. Learn how to change your Xbox gamertag through a browser, on your Xbox One or Xbox console, or in the Xbox app on Windows Error & Status Code Search.