I finished off my 4th play through with unlocking all skills and upon unlocking that as the final achievement I needed I closed the game assuming "All Achievements" popped too but after my save synced it was still locked, I thought I closed too quickly so I reopened and loaded my save but it still wouldn't pop so I verified my files and reloaded again but still nothing. I saw a post saying a guy had to beat the final boss again, is there any way to get it to pop or do I have to now do play through 5?