Interesting...
Phanx's little code snippet works fine. However don't use
http://addon.bool.no/ to generate the addon! For some reason this method does
not work. I dropped the snippet into the bottom of an addon Phanx helped me with and it worked just fine.
Now my acheesements are no longer account wide! Also Overachiever tracks Glorious! just fine
Pending on what addons you have you may be able to drop the
code into the core.lua with a text editor like notepad or
Notepad++. Do NOT place it in the Overachiever.lua as this did not work for me. I don't know which addons you use thus it's hard to say what may work at this point. I can confirm placing it within the Chatter core works.
Perhaps the great all knowing Phanx will enlighten us as to why the compiler method doesn't work...