- gamertag: Methew
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Depends on how it's implemented.
Crackdown, Prototype, inFamous, and Assassin's Creed all have similar achievements. Collect X orbs/items/flags. The problem is that they don't give you a checklist of what you have gotten and where.
So that makes it extremely frustrating if you have missed one by chance and must manually search every previous nook and cranny to find it again.