How do I check if I have met the achivement criteria from a previously unlocked achievement?

[Else]

I have previously unlocked an achivement and I meet the criteria, but It is not showing in my accomplished achievements

[Kaya]

In order to complete an achievement you need to find it in the achievements page and click the achievement. This will either give you the achievement, or tell you what you still need to do.

To go to the achievements page click the book in the bottom left corner.