Okay, I really enjoy using MultiMC. It is letting me still play with all my old 1.2.5 mods, yet still be able to explore the new features of 1.3.1. There's just one little hitch... it rebuilds the .jar each time the instance is run. Now, from a coding perspective, this is a GOOD thing, because it ensures a clean .jar file, not cluttered up by bits and pieces of mods you might not be using anymore. Unfortunately, it also wipes your achievements.

 

I was wondering how viable it would be to write a mod that would store all achievement data (probably per account) to a central location on the computer (probably in the .minecraft folder), then call that data when that account is run? I know there's a mod floating out there that saves the information to a 3rd party server, but I'm not particularly keen on having my data stored 3rd party. I'm just wondering if it is currently possible to code without needing to re-invent the wheel or add in a bunch of extra hooks, the storage of achievement data in a central location in your .minecraft folder to refer to whenever achievement-related code calls it?

Have you tried this mod? It doesn't sync your achievements, but it does ignore the checksum mismatch that causes your achievements to reset every time MultiMC rebuilds Minecraft.

wait, your achievements are stored between games? forget about changing .jar files, my achievements dont carry on between saves of the same game!

wait, your achievements are stored between games? forget about changing .jar files, my achievements dont carry on between saves of the same game!

Me neither!

Have you tried this mod? It doesn't sync your achievements, but it does ignore the checksum mismatch that causes your achievements to reset every time MultiMC rebuilds Minecraft.

 

Well, that does work for the most part. I suppose anything which retains achievements would have to bypass checksum conflicts in the process. At least as an interim fix, it works quite well.

 

Thanks!