Updated solution as Operation 5 had changed a few things.
This achievement is for creating your own escape map.
From the main menu, go to:’Multiplayer’
to go to ‘My maps’
Then select create new map.
You’ll want to make the map as short as possible.
Making it longer is optional if you actually fancy making a decent escape map for you and your friends to play.
Select and a build a start tile (should be top option out of the 3)
Place the start tile anywhere you want.
Then select and build an escape tile (bottom option)
Place it above the start tile.
Now after that’s done, press start and select ‘play map’
You have to play your own map first before it can be published. Once played on, return to editor.
Make a map name. In the middle you’ll see ‘map thumbnail’ you’ll need this also to be able to publish. Press the
button to capture thumbnail and confirm.
Nothing else is needed now once all boxes on the right hand side are ticked.
You can customize the description and add tags if you wish.
to finish off.
Once published your achievement shall unlock