Achievement System

I have been making the Achievement System since the last update, and I am nearly done now.

I have added 75 Achievements split in 9 categories, more will come in future releases.
The achievements were an after thought, or at least some of those I have added, as such the variables meant to keep track of them do not exist yet, that is the last thing left to do before the system is fully complete.

Everytime you hover an incomplete achievement (Marked with a "?" icon) it will display what you need to do in order to fulfil it.
In the screenshot's example, I was hovering the first icon, and to complete that objective I need to kill 10 goblins, that will earn me 1 point.
When an achievement is completed, the "?" icon will turn into the category's icon (A smaller version of it at least), and once the whole category is completed, the black silhouette will be replaced with the colored icon.

Once you gain enough points to unlock a reward scene, you will be able to view it and unlock the scene in the gallery.
The reward scene ("Charming test" in this example) is not supposed to look like that, it should have a preview thumbnail, but since the scene does not exist yet, it is a white background.
If you look at the top right of the thumbnail, you will notice a text saying "Undefined", that is one of the scene reward types.

Reward scenes will be split in three types:

• What-if: This scenario is a what-if scenario which is unable to occur through normal means because it is outside of your control. For instance, anything BellxIshtar.
• Story Event: This scenario occurs during the story, but it is not displayed during the normal flow of the story because it is either inconsequential or occurs in the past.
  For those who played Overlord H, this is basically an alternative to "Mirror events" whose feature was removed because the story no longer follows just the protagonist's perspective.
• Undefined: The nature of these scenarios is purposely left to the "player's headcanon", they could both exist in the story events or not.
  That is because some scenarios might contain spoilers, unlikely character personalities or simply do not fit my narrative (Even though they might still occur).