This is actually not obvious, at least not to me. Here's one way to solve it.
Create a second category-archive template that contains just a list of entry titles. The entire template could read something like this:
CODE
<ul>
<MTEntries>
<li><a href="<MTEntryPermalink>"><MTEntryTitle></a></li>
</MTEntries>
</ul
Set it up on your Archiving configuration page to output a title like
CODE
<$MTEntryCategory dirify="1"$>-list.html
Use that as an include file in your individual-entry template something like this (I think).
CODE
<$MTInclude file="<MTBlogURL>/<$MTEntryCategory dirify="1"$>-list.html.html"$>
There may be a more elegant way to do this, but I confess, I'm having a hard time coming up with it.
If you're already using PHP or SSI includes, you might want to use them instead of MT includes.