I think you can still get achievements offline if you're signed into your gamertag. I may be wrong though as I have never played offline before. Then to update your achievements just sign-in with a game that's working online.
You still get the achievements offline, yes. Zy are you saying you're trying to use the trainer in the online mode? I don't think it works online. I don't think any of them do. i would be ****ed if someone was pvp-ing me using trainers.
No, I don't do multi-player matches. When I say I play online I mean logged in and showing as online through games for windows live. That way all my achievements have time stamps.
What I was asking initially is if I will also be allowed to get the updated trainer since I bought the initial one and it stopped working. If not then that's fine. I can play offline I just won't have time stamps with my achievements.
Does that make sense?
Edit: It looks like I'm out of my money. Went to go re-download it from the link and it linked me to the old trainer, not the new one. Oh well. :/
Then to update your achievements just sign-in with a game that's working online. 
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