TalkPlayStation.com:"70% of Playstation 3 games that are already released will be compatible with Sony's answer to Xbox Live's Achievement system, Trophies.
The July issue of Official PlayStation Magazine UK states that:
"PlayStation 3 achievements - called 'trophies' - will be unveiled soon (this bit we already know, but here's the interesting bit), and 70% of games will already be compatible.""
http://talkplaystation.com/70-of-released-games-are-compatible-with-trophy-system/