Startup Idea: Universal Game Achievements Tracker

Startup idea to develop a web-based software system that consolidates and tracks a user's achievements across various gaming platforms, compares rankings with other players around the world, and incorporates competitions and rewards.

I would like a web-based software system that tracks ALL my achievements across all my video games, (XBOX, PSN, WII, PC, Blizzard Games) and displays them in a WoWArmory.com style where I can go through and see every achievement that I have and my world ranking vs other players! Also competitions and prizes based off said system :)