Dolphin is adding achievement support to its GameCube emulator with the help of the RetroAchievements project. Over 100 GameCube titles already have achievements defined for them, with more coming.
The Nintendo GameCube launched more than 20 years ago, back in 2001. It has plenty of classic games, including Mario Kart Double Dash, Tales of Symphonia, Super Mario Sunshine, Animal Crossing, ...