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If by Trophies you mean the PlayStation console trophies, there are none. Halo 3: ODST is only on the Xbox 360.
Yes it does
No it does not
Yes, you still get trophies if you download the games online.
To get trophies, you must buy a game that can earn you trophies. When you do a certain something, you will earn a trophy. You can see what trophies are available by inserting your game and clicking on 'trophies' in the 'game' menu an selecting your game.
Your trophies are sync'd to your online profile, but the only way to store save data online via the PSN is to be a PlayStation Plus member.
PSN is an abbreviation for PlayStation Network, an online network for PlayStation consoles.it is free and you can compete for trophies
If memory serves me right then yes it does Playstation has trophies
The trophies earned for Quantum of Solace on PlayStation 3 can be viewed by selecting the trophies option from the game section of the PS3's XMB. From there, select Quantum of Solace to view the trophies you have earned for that game.
Trophies are literally the same as Achievments on the X-Box 360. Although if you go online, other players cannot see your trophies. By the way, the PS3 game with the most PlayStation 3 trophies is definitely Burnout Paradise.
you don't