Hey there,

if you experience the same as me, where as you didn't unlock the "Solve Chapter 5" Achievement due to skipping levels ahead and you do the levels after. You have to play the Game from scratch, to be able to play from scratch you just delete all data in this directory here:

C:\Users\*username*\AppData\Local\Dogs_Organized_Neatly

You have to put in your username instead of "*username*" - alternatively you can press WIN+R -> type "%localappdata%" and search for the Folder "Dogs_Organized_Neatly". There you just delete the savegame file and you'll start from scratch.