Shovel Knight: Treasure Trove

For this achievement, you are returning to the Hall of Champions after completing it the first time as Plague Knight. The first time through, you fight the knights within the Hall and defeat them all.

When you return to the Hall of Champions, you can pay 500 coins to go through the Hall once again. This time, you are tasked with destroying all of the portraits within the Hall in every room. I had more than a minute left when I finished it (on my first try) so this one isn't too difficult. Here are some tips:

-Have an upgraded magic bar - 4 full segments makes this a lot easier than the basic 2 you start with

-Use the Big Boom Arcana. This bomb can destroy almost a whole 9x9 grid of portraits in one go when it hits the right spot.

-For your basic bomb, the lob casing is much better than the standard one.

-Keep moving!

-There are 2 "secret" rooms behind walls that you will need to go through to destroy every portrait.

-You know you have completed a room when the lights turn off. As soon as you do, start moving on to the next room. The general path I'd recommend is the following (clearing the rooms as you enter them):

S1__3__4__5
_____2__1__6__S2
________E

Enter the Hall (E)
Climb the Ladder (1)
Go Left (2)
Climb Ladder (3)
Enter Secret Room on your Left (S1)
Go Right (3) (Clear room 3 during this portion not when you first enter)
Go Right (4)
Go Right (5)
Go Down (6)
Enter Secret Room on your Right (S2)
Go Left (6) (Clear room 6 during this portion not when you first enter)

I used the float casing, big boom arcana and spin burst to unlock this achievement. I think the big boom arcana is the only item that's necessary, you can use whatever you feel comfortable with. Make sure to clear all the rooms by killing all guards and destroying all portraits (on your 2nd run or later), you'll know you're done with one when it goes dark.