Story related, cannot be missed.

You will nab this achievement after you clear The Lost Temple. After fighting your way through the temple and defeating the Construct Hulk, you will awaken a construct and take a quick ride with it. The construct will drop you off saying you need to speak with Eiderad before you go. Head back to Tri-Stone and approach the map marker and a cutscene will take place. After the cutscene you will possess this achievement.