Bunny Park

"Gather debris... ??? ... profit" is basically the primary gameplay loop, so unless you stop playing, you will get this one, likely within 2 hours of play. Unlocking more sections of the park will have more debris spawns for you to gather; I had 3 sections unlocked and had played actively for about an hour and a half.

The trackers seem to count debris gathered by your helper butterflies, because when I got this achievement, I was actually in the shop menu looking at decorations, and had been for several minutes.