To get this achievement, once you have prestiged and are met with the "Start button", Quickly click the rock and move some shards to the right by clicking. Once the shards reach the point where "The Stash" would be (It takes a few seconds for the gnorps to build "The Stash" at the start of the game, hence why you need to be quick) They will fly up and disappear, These will still count as collected and this achievement will unlock.