Goldie BlocksG 10

You will likely get this through normal play of the story mode, but if not go back to Blue Shadow Virus where there are lots. Best place to get the "UH OH!" achievement as well so get them at same time.

If for some reason you don't unlock this during your main playthrough of Story Mode (some people have and most others haven't) and have already unlocked any of the Chain Gunner characters (I used Hevy) I recommend heading into Free Play Mode for Chapter 3 of the Asajj Ventress (pink line) storyline titled Blue Shadow Virus (on Naboo). In this level there are 30 gold blocks that are all within very close proximity of one another in the underground facility. Achievement unlocked after I destroyed 10 of them but continued to count them for this guide.