PS3 trophies mandatory in 2009

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At fault for the mystery was that unlike Microsoft's mandatory approach to gamerscore achievements, Sony left the option to implement trophies up to the discretion of both internal and third-party developers. At that time, Sony's director of PlayStation Network Eric Lempel told GameSpot that, eventually, all new PS3 games would include trophies.

http://au.gamespot.com/news/6201444.html