| Be careful!
This level or achievement has been known to feature a bug. Please attempt it with caution.
Galactic Vandalism is an Achievement in Run 3, one of the first that a new player will achieve. Since all you have to do is dislodge a whole bunch of crumbling tiles, there is no preferred character. Choose whichever character you would like. The Child and the Ghost are not recommended, because they cannot dislodge tiles unless they jump off of them.
The easiest way to get this achievement is to replay Level 10 of the Main Tunnel again and again and dislodge one of the tiles every time. Because of how many crumbling tiles the level has, the multiplication of the dislodged tiles with easily reach 700.
It isn't necessary to keep on replaying Level 10 though, because you will meet many more crumbling tiles in the future. However, if you just want to get it over with, Level 10 would be the fastest way to get this achievement with a small selection of explore mode levels to choose from (unless you want to play Infinite Mode; that works too).
On Cool Math Games, this achievement is impossible to get, along with A Journey of 1000 Light-Years. If you play there, you will not get it. The achievement will still show up on the list of possible achievements, but it will not be awarded to you.