MagicUnloadedAchievement

An achievement where the mod spec is missing, but the achievement status is saved. This happens when the player removes a mod that has achievements, or when they update a mod and the mod removes achievements. The achievement's progress and spec are recorded in common, so this is loaded and displayed from there. This way, switching mods doesn't delete a player's achievement progress.

Unloaded achievements can't be modified, but their state isn't lost. They're just frozen.