9 plus the lost islands from this event and the previous event.
Edit: and 3 galaxy.
all of them: 4 galaxy, 15 standard island and the 2 lost ones (lost island and lost olympus) :-)
I have 9 islands + gemstone, lost Olympus and 4 galaxy
I have 7 normal(almost 8), gargantuan island, gemstone island and three Galaxy islands