Darksiders

As you are working your way through The Black Throne, you will find a block that is floating but has a few chains keeping it anchored to the ground.
Destroy the block/chains and the weapon/equipment will be yours.
Story progression weapon.

This achievement is story related and cannot be missed.

During your progression through The Black Throne tower you'll come across a glowing, floating statue head binded down the ground by some chains. Just attack the statue head/chains and inside will be the Voidwalker. If you love Portal/Portal 2 then you're gonna love this ability. haha

This achievement will also earn you 10G!