I'm sorry you're having trouble! Please send us an email at help.minecraft.net/hc/en-us/… and we
will take a look for you. Remember to attach your Transaction ID. ^AS
I'm sorry you're having trouble with logging in! It's currently a temporary issue that we're hoping to get fixed soon. Thank you for being incredibly patient! ^AS
I'm sorry for the inconvenience caused by this temporary issue. For updates to status, make sure to follow @MojangStatus. Thank you for your patience. ^RS
I'm really sorry, but once you put your World into Creative, there's no way to bring back achievements. You would need to make a new world to continue getting them. :( ^AS