As I am logged in using the same Xbox Live Login, I was expecting to see my achievements synchronised across both the Windows 10 edition and the Android platform also.
As it is, they are separate despite using the same login.
Linked issues
is duplicated by 7
MCPE-182011
Achievements are not synchronized
Resolved
MCPE-62644
My Achievments are Gone
Resolved
MCPE-65808
Achievements don't transfer with account
Resolved
MCPE-135111
Minecraft Achievements
Resolved
MCPE-162403
minecraft on my new device says I've barely completed any achievements
Resolved
2 more links
For now, this is the intended behavior.