The "Inception" achievement which requiresyou to "Push a piston with a piston, then pull the original piston with that piston." does not unlock on the most recent Windows 10 version.
Please see MCPE-16417 which references this issue, however that case was marked as resolved since it appears to be fixed on the Android beta (no confirmation on the iOS version).
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I have no idea why a mod decided to mark this as resolved, because it isn't. Maybe mixed it up with the Android / iOS version? Even in the currently latest version (0.15.10, not a smart naming pattern btw since 0.15.90.7 is older) of the Win10 version this achievement still won't pop.

[MCPE Mod] rplatham added a comment - 26/Sep/16 10:11 PM - edited
That is correct William Fulton because the fix is in a beta testing version only out on Android. When 0.16.0 is released, the fix will be included for Win10 and other platforms.
The patch vor 0.16.0 is coming on 18 october.

[MCPE Mod] rplatham added a comment - 26/Sep/16 10:11 PM - edited
That is correct William Fulton because the fix is in a beta testing version only out on Android. When 0.16.0 is released, the fix will be included for Win10 and other platforms.
The patch vor 0.16.0 is coming on 18 october.

I can't get the achievement. Not sure why but been flipping the level for a while '-'

I can't get the achievement. Not sure why but been flipping the level for a while '-'

I don't believe this is resolved, or perhaps is broken again... I am on version 1.0.5.54, Windows 10 edition on a realm and the achievement isn't unlocking.

I don't believe this is resolved, or perhaps is broken again... I am on version 1.0.5.54, Windows 10 edition on a realm and the achievement isn't unlocking.

I'm having this issue too, has anyone found a solution? :/

I'm having this issue too, has anyone found a solution? :/
I have no idea why a mod decided to mark this as resolved, because it isn't. Maybe mixed it up with the Android / iOS version? Even in the currently latest version (0.15.10, not a smart naming pattern btw since 0.15.90.7 is older) of the Win10 version this achievement still won't pop.