The UI was made to be very simple while keeping a clean layout. On the first launch, the app will build the cache for all your games. This process can take a while if you have a lot of them but don't worry : after that you're ready to go and it will load pretty fast.
Display highly customizable notification when you unlock an achievement. Change the sound, take a screenshot, make your gamepad rumble, notify on progress, choose what to display and how.
By unifying as best as possible all your different achievements source and fixing their respective quirk. You can enjoy your achievements in a streamlined interface and experience no matter where they come from.
From official Steam client, to various Steam emulators, and even RPCS3 Sony PlayStation 3 emulator. This is an on-going endeavor but you can check the full list of what this app can import.
From filters and sorting options, to language choice, to view hidden achievements, to merging duplicates, to notification, to achievements sources, to blacklisting, there are plenty of settings to play around with.