This achievement may in fact be unobtainable, not necessarily because the achievement is glitched, but because you cannot knock any object over, and they appear to be locked into place.
I'm not sure if this is just occurring for me or if there are any specific objects you should knock over. But after obtaining all other achievements in the game, my % was still at 0.
UPDATE: It seems that me, and various other users are also experiencing this problem, the devs have stated that they are aware of the problem, and looks to fix it in an upcoming patch, so stay tuned.
Update 2: After several months of ignoring my messages over Twitter, they finally responded:
"Hey Jake, we've been working on some fixes for all platforms, unfortunately we've hit some setbacks. Can't give any hard timeframes atm"