If all else fails then delete your saves, uninstall then reinstall the game without reinstalling the patch.
Collect all collectibles whilst playing offline, not connected to the internet.
Redo some levels and look for collectibles as you may have missed one causing the incorrect statistics counter.
Collect all collectibles and complete all optional objectives in single player before playing campaign in co-op mode.
The trophy may still unlock even if the campaign percentage does not read 100%.
Keep note of which collectibles and optional objectives you have completed and don't rely on the in game statistics screen as this may be incorrect.
There isn't a sure way to fix this problem but some below tips may help in preventing it from happening or overcoming the problem: You may find all collectibles and completed all optional objectives and still not have the corresponding required completion percentage. There seems to be a problem with statistics being recorded for collectibles. I will leave existing information in the guide for reference Please disregard all references to the glitches relating to collectibles. Note: As of Patch 1.03 the Dedicated Trophy has now been fixed.