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You need to do the following in a child theme, do not make changes to the theme itself.

EDIT

I had a good look at the ‘Heuman’ theme. I think to solve your problem here is to copy the following files to your child theme, content.php and archive.php

Rename your content.php to something like content-archive.php. Open it up and delete the following lines

<?php if (ot_get_option('excerpt-length') != '0'): ?>
 <div class="entry excerpt">                
   <?php the_excerpt(); ?>
 </div><!--/.entry-->
<?php endif; ?>

and replace it with

<div class="entry content">             
   <?php the_content(); ?>
</div><!--/.entry-->

Next, open up your archive.php and replace he following line

<?php get_template_part('content'); ?>

with

<?php get_template_part('content', 'archive'); ?>

That should solve your problem