Im on the 2nd park,the one with the robots. I have gotten a gold trophy on every single mission except for Clearence Sale. It says to clear the park of Robots. Robots remaining just stays at 13. Even when it said 13 and I went and got a gold trophy on a challenge, I got a message saying 30 robots leaving the park, but the Robots Missions still says 13 remaining. How to I get rid of the remainder robots to finish the quest and get my achievement?

Just an update, I went back to the park again and now its down to 4 robots left in the park. I let the game run for awhile thinking perhaps I have to wait till the next in-game month but still cant get rid of the last 4. Anyone have any ideas?

Unfreakin believable. So I went ahead and skipped this achievement since it was obviously glitched and went to the next park. I did every single mission and got a gold trophy except for one. You have to play that mini-game where you match the buttons to the cheerleader song. But I cant even finish that one cus every time I go to play the mini-game the cheerleaders dance around but the music never starts. I let it run for 15 minutes and the song would never start. I tried exiting and reloading and same thing happens. So two glitches in a row where I cant get 100% on a park. What a crappy designed game.