Download: http://adf.ly/669795/noachievements Yes, it's an AdFly link. Just wait your five seconds, and click the "Skip Ad" button in the top-right corner. You'll get your download, and I'll get some pocket change. Support mod authors!
Download the file, "vu.class".
Find your minecraft.jar and replace the existing one in there with the one you downloaded.
Delete the META-INF folder in your minecraft.jar if you haven't already.
Check out my other mods!
I, personally, recommend using MCPatcher to manage your mods, though by no means is it required. It handles the hassle of backups, patching, and re-patching for you. That's right: no more copying files, and you can always roll back changes if something gets messed up.