Well done. I find that this badge is quite the aggravating combination of having to play carefully and hoping the RNG doesn't decide to just murder you. I've made it as far as level eight on this one and have no plans to try to make it any further. Maybe if there was a guaranteed combat shotgun on level 2 or the RNG only generated winnable levels, but I don't see either of those happening. I do make an attempt at it every once in a while, but anymore than 2-3 in a row and I want to smash my computer. I get really sick of replaying level one just to get dropped on level two in the corner with the stairs, forcing me to clear every nook and cranny on the other side of the level and then somehow try to make it back in time, all with a pistol and a couple of shotguns.
So in summary, you must have the patience of a saint because I've been able to brute force a lot of diamonds and I just don't have this one in me.