I have 9 fully explored maps in a 3x3 square of item frames as the achievement says and its not popping. The 9 maps are 1:1 maps of areas outside of the 1:8 map that I spawned with.
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Thank you for your report!
We're actually already tracking this issue at MCPE-27720, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Can you show us an image?