So, through the wonders of the hive mind, the locations of all the monsters in the Google maps 8-bit quest have been uncovered.

To see the map with all of them pinned, go here: http://maps.google.com/maps?q=http%3A%2F%2Fxhtml.im%2Fmonster%2Fall.kml%3Fmapmonsters%261&hl=en&ll=11.867351%2C-3.515625&spn=150.460005%2C335.390625&sll=28.304381%2C-15.117187&sspn=147.307759%2C335.390625&t=8&z=2

h/t David Schwab.