I've got quite a problem here.
For the last few months, I had my launch-360. Still running beautifully. I had just beaten Saints Row 2 & The Third, Fight Night Champion, and ME3. Gained alot of achievements on them, too. This is important later on.
Now, this xbox was not connected to the internet. These achievements were never sent server-side. Soon after beating ME3, my 360 finally gave in and red ringed. This is where this gets tricky.
My uncle just bought me a 4gig 360 S. This has built in wi-fi. I plugged it in and redownloaded my gamertag, the same one I had played the aforementioned games on and achieved many things. However, since it was not connected to the internet for any of those games, the achievements didn't come with my gamertag.
My question is: If I were to transfer my profile onto this new xbox, would it merge with this version of the profile, being that they're both the same gamertag? Or do I simply have to suck it up and play through all those games again to get the achievements and whatnot on this outdated version of my gamertag?
EDIT: Also, if they can't merge then either way I'm gonna have to replay some games, as this gamertag thats missing alot of the achievements now has LA Noire and GTA IV on it, something my other one didn't have.