Missing one achievement?

My profile shows that I am at 21/22 achievements for Doodle God, missing the God of Patience achievement, but I completed this achievement almost a month ago on April 30th.

For all I know there could be other achievements missing, but this one is obvious because it's the only game I've 100% that isn't in my completed list.

What is the solution for this?

Play the game while being online and rescan.

That did it, thanks!

Good to know there is a way to fix this if it happens again, much appreciated.