They are Trophies you get that tell you that you finished a level + did it well
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You need to complete all 4 stories,so if you don`t do any stages other than those in story mode,it is 56 emblems.
When you get all 130 emblems you can play as metal sonic on trial.
Yes, you need to get A's on every mission and get all emblems. The team is: Speed: Neo Metal Sonic, Power: Chaos 0, Fly: Eggman in his Egg Flying thinermajig...
There is no Sonic Heroes 2.
in sonic adventure dx you can only unlock metal sonic by collecting 130 sonic emblems.