Hey everyone,
To start off, you CAN get this in freeplay mode if you missed it the first time.
Here are the boxes in the order I found them. There are big and little boxes, the big boxes are like a stack of 3 whereas the little are just a singular box and are easier to miss.
1) Far right as the level starts. You should see 2 non-Lego trees and a Lego house plant next to it. (Big Box)
2) After getting #1, head left and break the table. There will be a box right before the entrance to the kitchen. Smash it up and keep goin (Little box)
3) Near the table on fire, use Frozone to put out the fires and hit the box infront of the table. Should have pots and pans in it (Little box)
4) Deep into the kitchen with the table on fire. It will be on your left under the stairs. (Big box)
5) From #4, exit the kitchen and come at the screen into the middle. There will be a grand piano and if you keep walking back (toward you?), you'll see a box of toys and whatnot. (Little Box)
*Progress the level forward, utilizing the boss's electricity as hinted at by Dash*
6) Once you see the snowman, we can keep going. On the back left of the room (where we couldnt go before) you'll see a box with some memento's. Smash that one too. (Little box)
7) Go to the snowman in the middle of the room and look up with a aim shot character (Violet and hold X). You may have gotten this one by accident but aim up to the box on the ledge a little off screen. (Little box)
8) After using Violets invisablity to get across the debris, you'll see another box of junk on the balcony. Near the acid spill. (Little box)
Note: Just smash everything, the bigger boxes have little tiny tiny bits that need to be smashed for it to fully count. This achievement should pop mid level and if you don't get it before the outdoor fight scene, you missed something.