Load Achievement.dbc's IconID (added to the WotLK DBC layout, field 42) into
the achievement cache and resolve it through SpellIcon.dbc to the artwork.
The earned list now renders a bordered 32px icon with the name and points
beside it, replacing the gold-star glyph; a star placeholder fills the slot
while an icon streams in or when one is absent. Icon textures are lazily
BLP-loaded and cached in WindowManager with a per-frame upload cap.