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@david-martin
I’ve one-birded each room in a 5-room level, if that’s what you mean. That’s what the Game Center achievement is for. Obviously it takes at least one bird per room (glitches notwithstanding – every now and then I “zero-bird” a room due to a structure appearing with something missing or a leftover piece of flying debris carrying over from the previous screen, and since the game doesn’t count this as a strike, I’m willing to bet it wouldn’t give you the achievement if this happened).
Clearing a 6 or 7-room level by one-birding at least 5 of the rooms seems to also trigger the achievement.