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Barozi said:

These are usually used to keep the achievement/trophy list spoiler free. Most commonly used for story achievements.

Maybe incidentally, but I would’ve had much more of them if that was generally the case. And their percentages would be higher. I could just be ‘unlucky’ in my game choices, but the few hidden ones I actually have were of the “Feed the monkey” calibur, keeping with Uncharted 4.