Not a problem! I write these posts like I write emails, just force of habit lol.
The thing with save games is that you are playing someone else’s save from their console. Any achievements they may have unlocked or things they have done will be in the save. I would only advise using save games if you are missing a few achievements since any achievements included with the save will unlock all at once and that could be seen as achievement batching by Xbox Live servers. Game saves are only timestamped as a save, no individual achievements will have timestamps until you load the save and achievements start popping left and right then the current date/time is stamped on the achievement(s).
As for obtaining said save games, this link has every save you can think of for any Xbox 360 game: https://www.thetechgame.com/Downloads/cid=45/xbox-360-game-saves.html. You just type in the game and a list of saves is given to you. You will have to use Horizon and a flash drive formatted to FAT32 to change the console and profile IDs so your console can read and play the save successfully. For your reference, here’s a thread that describes how to use Horizon: Horizon | The Basics.
Let me know if you have any other questions or need something cleared up!