RetroAchievements and Challenges

https://retroachievements.org is a set of modified emulators (including RetroArch) and an online database allowing you to unlock and track achievements in emulated games.

Metropolis Launcher helps you keeping track of (un)locked achievements for the supported games with its RetroAchievements feature.

On top of that, Metropolis Launcher lets you create challenges:

- define multiple tiers per challenge having multiple achievements

- when all achievements in a tier are unlocked, the next tier is visible

- in multi-user mode a user may be bound to a challenge, so that only games of the current challenge/tier are visible to the user

Challenges can contain RetroAchievements and additionally runtime-based achievements. You can use runtime-based achievements for games which are not supported by RetroAchievements.