yes
No, the Steam achievements have nothing to do with the Xbox Live achievements.
Nothing. It is a way to keep you latched on to a game and/or console.
i not sure but i think you can download it if you have xbox live
no its for every game
Technically, if you play a game on Xbox one that you played on the xbox 360 then once you start playing you will get all the achievements (basically like double gamerpoints) but not in-game progress*. *some games like happy wars and world of tanks etc. save in-game progress and achievements.
No you cant get achievements for the original xbox games, sorry.
No you can't.
No, it never came out on the Xbox 360. The only splinter cell game with achievements is Double Agent.
Over 50 Achievements.
no
Every game that doesn't say XBOX Only.
yes