They are so frustrating.... Three of them have glitched on me now and it sucks big time.
It's like a normal thing for dead rising games it seems. One of the cheevos on Case Zero glitched for me as well!
I wouldn't mind but the cheevos that have glitched are lengthy ones as well... 50 Survivors, Zombrex Posters and Chuck Greene: Cross Dresser.
Have many other people experienced glitchy cheevos as well?