"Spend sP equal to the achievement tier in one purchase at the Millionaire Center!"

I need the 20 mil tier. Can I spend more than 20 mil, or does it have to be equal to 20 mil? It seems I might be stuck with only the Pirate Cutlass as an option to buy since that's the only one equal to 20 mil. If I can spend over 20 mil, the next item in line would be 25 mil. I sure wish there were more options closer to 20 mil so I'm not spending an extra several million on an item I don't even really want :D

I'm pretty sure it's at least 20m, not exactly 20m. Have you bought a pet slot yet? It's in the MC so I don't see any reason it wouldn't count for the achievement and it might be more useful to you than an item you only want to try and resell?

Oh yes I'm at the 60m tier for pet slots unfortunately. Good thought though!! I think I'll quiz my friends to see if I have any battlers that need a tier 7 weapon :) Thank you for your reply!!