With the new Okri Challenges there is a great opportunity to create new achievements for the game. You already made icons and checks for the requirements in-game along with implementing all the old achievements as Challenges.
The original set of achievements are pretty basic but would be a lot more interesting if the challenges were converted into them as well.
Me and a lot of my friends enjoy the hunt of achievements as a way to see completion progress and with the current set we could finish the avalible ones and still have a bunch of stuff left to do.