Dungeoneering Badges-

[Echocut]

There's also David if you kill a monster much higher than you. :P

 

I've done that plenty of times and i've never gotten that title. unless praying doesn't count.

 

I would have thought for the title David, praying would pretty much be required.

 

On regards to Goliath, I've gotten it just by failing and dying to a floor trap. (Unless that has been fixed now.)