No you cant get achievements for the original xbox games, sorry.
No you can't.
no
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i not sure but i think you can download it if you have xbox live
No, but on some games the achievements will not work if cheats are used.
avatar: legend of angg the burning earth. seriously it takes about two minutes for 1000 gamerpoints :)
25G is the gamer score (known as achievements). All games have this gamer score.
Over 50 Achievements.
No, Xbox 360 games can only be played on the Xbox 360. However some Xbox original games can be played on the Xbox 360.
The Xbox 360 can play original Xbox games but the Xbox doesnt play Xbox 360 games.
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.