Achievements Back Button

Adds a back button to the achievements frame that works like a browser history.

 

Soul approves: 😀
https://www.youtube.com/watch?v=Ng7PN2P_pLE&t=91s  

Inspired by and dedicated to Taliesin:
https://www.youtube.com/watch?v=H8fVzxmEiOA&t=64s