Steam says 11% of players have this achievement, which means about 1/3 of all players who started the game have it (the "most achieved" achievement has 30%), so it is somewhere between "very easy" and "utterly trivial". I can't get it to unlock. Does it require a particular map, such as the default world? Do I need to clear the list of unlocked database entries so that I unlock a database entry "for the first time"?