improve achievement management and and views

app/helpers/achievements_helper.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module AchievementsHelper
+  def achievement_completed(achievement_id, user)
+    CompletedWowAchievement.where(wow_achievement_id: achievement_id, wow_character: user.wow_characters).exists?
+  end
+end