I have a question to all peple. I have played almost evert halo, but i also completed reach, odst, and halo 3 on legendary solo. and played alot online. Yet when i go to this site it says i never played those 3 titles… do i have to beat/play them again for them to appear?
Hey Titan, if you’ve changed your gamertag at any point then your stats will still likely be synced to that old tag. You can sync them back, you’ll just need access to the games again and an Xbox Live connection. If you load up each game and play come campaign / multiplayer / forge / customs, stats should sync up after a short while 
That seems like a long process.
ok but would it work for mcc because i don’t have halo 3, or reach on there own disk. thank you because i did change gamer tag a while ago.
No playing MCC won’t get your old Halo 3 stats back I’m afraid, it has to be the original Halo 3 as they are both separate games with separate stats and achievements
ok thank you for your help.