Hello everybody.
As I was posting today's earlier announcements, I then discovered your discussions about finishing the inverse levels in world 1 triggers the achievements for inverse worlds 2-4.
I want to apologize to everyone who wrote to me about this and seeing this issue being resolved just now. Part of it is not getting notified when a discussion has been brought up, and it's also a learning experience (this is my very first shipped game).
I will be making an effort to regularly check my discussion boards starting now. I'm very sorry that it took this long to address this issue, and it really means something to me when there are players that care enough to notify bugs in a very unknown game.
Have a wonderful rest of your day players.
Sincerely, Michael Taylor (Developer)