/var/mobile/Applications/92F57312-E569-4B56-B639-92210CE94828/Documents/Checklists.plist
is the file path on the iOS device itself, and has no relevance to your OS X drive and its files.
You should be able to use the Devices pane in the Xcode Organizer window to access files in the Documents folder on the device, or in iTunes (provided your app specifies that it allows that type of access).