I know of at least one iOS game that unlocked achievements on my Xbox Live account and it was called Wordament. I'm wondering if I play the new Halo: Spartan Strike game on iOS will it unlock achievements in my Xbox Live account like Wordament did? Or will it just be iOS achievements and not added to my overall Xbox Live gaming score? I don't own the game yet. I'm trying to figure out which platform to buy it on and this is a deciding factor for me.
The iOS (okay... iPad) version of Halo: Spartan Assault is not linked with Xbox Live Arcade in any way, due to the way the APIs are handled in each version of the game. The iOS version is locked to Game Center.
Steam uses the Steam API (in
steam_api.dll) to add achievements to a Steam account, the Windows Store app does not record (as far as I know) achievements, iOS links straight with Games Center while the XBLA version links with your gamertag.
Your only option for it to increase your gamerscore is to purchase it through the Xbox Live Arcade channel; platform.
This should be obvious since there is no way to log onto XBLA through any of the versions on the other platforms (apart from the Xbox version).