I kept trying to get the map room achievement on bedrock edition, and it seems to be unobtainable. I have checked over all my maps, and my theory is that it has something to do with 1.13 changing maps and probably making the map id's bugged.
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3/4 maps with normal item frames, those are the standard

Thank you for your report!
We're tracking this issue in MCPE-27720, so this ticket is being resolved and linked as a duplicate.
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yes, I did use locator maps.