The thing is you seam to have multiple problems but aren't stating them directly. Instead of asking how to fix those problems, you're asking how to fix some problem with a flawed work around you think will get you what you want. The whole post seams very cryptic. Here's what I think is going on.
1) You've installed Eq2Maps. It created an eq2.ini file that's pointing to that custom UI directory.
2) You've installed some other mods to separate UI directories but didn't change the eq2.ini to point at them.
3) You're logging into game and trying to use /loadui to load multiple UI sets at once (which will never work)
4) One of the sets you're using bugs the Acheivement window.
The first thing you need to do is consolodate your mods into 1 custom UI directory.
Then you need to edit your eq2.ini skinname to whatever that directory is named. Make sure all the custom files load automatically when you log in.
Once that's done run the eq2maps updater so it downloads all the map stuff to your custom UI directory.
If your Acheavment window is still bugged, but everything else loads automatically, compare the code in your custom eq2ui_mainhud.xml file with the default version. Make sure everything in the default file is present in your version.
If you still can't get it working after all that, you'll need to provide clearer info on what exactly you've installed, what your directory structure is, and what the text of your eq2.ini is.
Note: if you don't know anything about an eq2.ini file, you should probably read the FAQ on this site.
Note 2: Reverse psychology would be something along the lines of "You don't want to help me, that would make you feel good about yourself". A statement designed to get the person to do exactly the opposit.
What you basically said was you guess the ppl on this site are more stupid that you thought. That would be an insult, not reverse psychology, and not a very good way to get help with your problem(s)