This is a just a quick guide on resetting your gameplay objectives if you've completed them all or not.

First un-check hidden files/folders

then go into

Users/Appdata/LocalLow/Asbo Interactive/Shred! Remastered - and just under the folder named Unity you should see a .dat file named ShredPrefData.dat delete this and you should be good to go, all your level objectives should be reset and you can go through and complete them again if desired.