Destroy 100 Droids with the Clone Chain-gun.
This is a Hidden Achievement/Trophy which can be done easily in the Geonosian Arena. There are a lot of droid roaming around the area.
Be sure to have Lieutenant Thire in your group since he has a Clone Chain-gun. Once you are in the Geonosian Arena, just wait for the Droids to spawn then shoot them with the Clone Chain-gun.
Once you destroyed 100 Droids you will earn 10 Gamerscore for the XBOX 360 and a Bronze Trophy for the PlayStation 3.
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