First of all let me tell you that I hate this game with a passion and having to finish it 3 times took a metntal strain on me and the relationship with my girl.
I got this thanks to BEN186422 who actually finished this mess of a game 5 times to get it right.
Keep in mind that if you miss anything on V. 1.0 you can finish the level and once you start it again the collectibles, enemies & crystals will add and sum to what you already found on your previous run.
Here is what you do. (On Hard Mode Of Course)
1. Start a game on v1.0 and 100% all levels EXCEPT THE FINAL ONE ( if you do this level you cannot move the character anymore).
2. Move the character to the starting point.
3.Backup a save on a USB or CLoud just to be sure.
5.Update to latest versione . V 1.5 as of 10/2020
4.Sweep all the levels and get 100% on the new ones. Keep in mind that you will have to finish previous levels for the next one to unlock . I personally had to do Lvl 4 again since it did not register that I killed all the enemies. AGAIN DO NOT DO THE FINAL LEVEL.
5. Once you have done all the levels at 100% make sure you have everithing by checking the counter on the map in the top ight corner.
6. Do another backup save
7. If you have everithing at 100% (all levels golden) go ahead and do the final level. Hat trophy should unlock as soon as you finish ( do not forget to get the secret lion head in the boss level.
Now I personally did not have trouble finding videos showing the how to get the 100% in all levels except Nr. 8 in v.1.0 or 9 in V. 1.5 Raging Ruins.
Here below is a link to the video I found of Raging Ruins. ( Ill add it as soon as I manage to find it again )
Good luck and GodSpeed my fellow masochists