I've actually ran into a bug in my game that's made it impossible to complete one of the tasks, during the "Save the Bird!" mission, all the enemies instantly know I'm there, when I get to the second screen they will always hit the switch, stopping me from completing it, when I go back in they instantly hit the switch before I even get control, and then the cycle starts over.
There was a part earlier where I sneaked and stole the panties of a princess earlier, and the guards there all knew I was there, but I thought nothing of it, as there was no issues involved there, but now this actually needs me to stealth, and I can't complete it.