RetroAchievements

This post is part of the Game Boy series (#9). Last year, I discovered RetroAchievements and had a lot of fun since then. You can play old games, for example for the Game Boy, in an emulator, and are able to unlock achievements, like finishing a level (or the whole game) or achieving a challenge like finishing a boss damageless or a level with a certain time limit. This is how it looks: If you beat all challenges and unlock every achievement from a certain game, you get a Mastery badge, lo...