Originally posted by un4given
If it only unlocks 51% of the trophies, obviously you still have half left....
51% doesn't mean they have HALF of the trophies. Each trophy has a different % value. So 51% could mean they only have 12 of XX depending on the amount of bronze,silver and gold they have already achieved.
There is a thread somewhere on ps3t.org that explains in great detail how the trophy system works.