Here's my video guide for this as well as the 'Ship Rite' and 'Inspector' achievement
Attained simply by killing the 'champion of the dark' (final boss) in the first selectable mission on Earth: 'Restoration' (your first PvE mission immediately after your first visit to the tower). The boss is very easy to kill and takes critical damage for headshots.
*** DESTINY GLITCHED ACHIEVEMENTS FIX ***
Destiny Achievements are VERY glitchy. In order to unlock achievements
you have already met the requirements for you must cycle your connection
to the Destiny servers. The easiest way to do this is as follows;
ENTER the game > Press START > LOGOUT > SWITCH PROFILE >
CHOOSE your GAMERTAG > SELECT your CHARACTER > POP goes the cheevo
Hope this helps!
Happy gaming
-coreymawf