Thanks for the reply Paul,
I upgraded from WP3.6, Achievements 3.4.1 to WP 3.8.1, Achievements 3.5.1
Upon upgrading wordpress, I also upgraded buddypress to the latest version 1.9.1
The template file that I overrode was:
following a fix I found here: http://wordpress.org/support/topic/user-achievements-index-not-displaying
I also overwrote the widget file itself at:
my theme is placed in /wp-content/themes/THEME_NAME/achievements
My wordpress skills are pretty rudimentary, but I attempted to rewrite my changes for Achievements 3.5.1, WP3.8.1, but failed to get any sort of inheritance working with the theme, however, all the changes that I make to the plugin itself seem to be working fine (as in if I edit it from the plugin directory directly). As of now, I'm using that hack to get it showing, but this is far from a good solution ;).