How to render field attribute in foreach
As I understand your question, I recommend you to use for statement, you can do this:

&lt;ul id="slideLinks"&gt;
&lt;?php $slide_link = $node-&gt;field_slideshow_link['und']; ?&gt;
&lt;?php for ($i = 0; $i &lt; count($slide_link); ++$i): ?&gt;
    &lt;li&gt;&lt;a class="slideControl" href="javascript:void(0);"&gt;&lt;?php print render($slide_link[$i]['title']); ?&gt;&lt;/a&gt;&lt;/li&gt;
&lt;?php endfor; ?&gt;
&lt;/ul&gt;


This will print all your titles...