I unlocked them regardless of the fact that I didn't have them.
I got the Luigi's Mansion Luigi trophy without having the file saved.
I got the Pikmin trophy without having it.
And I got all the others that "need" a save file of that game, without them. All I had left to get were Diskun, Samus without her helmet, and Mario & Yoshi.
Credit for Sig & Avy goes to Yogi_Bear