Have you completed the previous goal? You can't claim them out of order.

I take advantage of the post, the Cashew outfit unlocks the character if you don't have it. I started playing when Mac event came out, in this time I've managed to accumulate 280 diamonds, of which, I used 200 to acquire two x8 multipliers and get the x64, I'm saving the rest to unlock the other characters and I had planned to go in order as they appear in the store, being the first one Ace.