Have you thought about this? One score for all the platforms? I'm definitely not someone who chases these scores, BUT it would be cool to see the score grow, as you play on separate platforms. The system definitely would need some thought though as it's not obvious how to equalize achievements from entirely different platforms. Maybe just start with a "Total" for all platforms. Some kind of "ExoPhase Level System". Example: you have 352 achievements/trophies across all platforms supported by ExoPhase. You're level 3. To get to level 4, you need to earn 48 more. Or something like that.