To add insult to injury, people who are getting it after the hotfix are actually getting the mail...sigh.
What you need to do is this. There are two type of bomb. Proximity and Interact. Proximity will disappear when you get close to it and interact, well, you interact with. There is a cycle of bombs. It will go Proximity - Proximity - Proximity - Interact. You need to complete this cycle at least four times without letting ANY of the bombs go off, proximity or interact. If the fight continues on any longer you need to continue clearing the bombs otherwise you fail. There may be something wrong about this, but it's how we got the feat. It's tricky and the biggest pain is the slow put on you by Captain Cold's attacks, so I put on my breakout trinket and that helped a little. For note, the 'destroy' refers to the ones you can interact with. Also, you can wipe and retry the feat. No need to redo the whole duo.