Quickdraw Medal!
Some may argue this is the most difficult medal to get, but I think it's pretty easy. Simply use a combo of homing and piercing arrows, with extra turrets activated and spaz click with the hold option on.
After a few tries you should get it. Click through the dialogue and options quickly and select your options as fast as you can because it counts in the time. I suggest setting your combo to the number 1, then quickly going through dialogue and pressing one. If you used the same combo in the previous level that you played, it should be set automatically.
It may take you a bit of time to get it right, but each time only takes about 30-40 seconds until you get down to the coveted 20.
Remember this is for the Boss of the Future Fantasy Era!
I got the medal myself! Try it!