Deprecate Achievements as they are not present in future versions of Minecraft

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/Achievement.java

@@ -2,7 +2,9 @@ package org.bukkit;
 
 /**
  * Represents an achievement, which may be given to players.
+ * @deprecated future versions of Minecraft do not have achievements
  */
+@Deprecated
 public enum Achievement {
     OPEN_INVENTORY,
     MINE_WOOD (OPEN_INVENTORY),

paper-api/src/main/java/org/bukkit/entity/Player.java

@@ -406,7 +406,9 @@ public interface Player extends HumanEntity, Conversable, CommandSender, Offline
      *
      * @param achievement Achievement to award
      * @throws IllegalArgumentException if achievement is null
+     * @deprecated future versions of Minecraft do not have achievements
      */
+    @Deprecated
     public void awardAchievement(Achievement achievement);
 
     /**
@@ -415,7 +417,9 @@ public interface Player extends HumanEntity, Conversable, CommandSender, Offline
      *
      * @param achievement Achievement to remove
      * @throws IllegalArgumentException if achievement is null
+     * @deprecated future versions of Minecraft do not have achievements
      */
+    @Deprecated
     public void removeAchievement(Achievement achievement);
 
     /**
@@ -424,7 +428,9 @@ public interface Player extends HumanEntity, Conversable, CommandSender, Offline
      * @param achievement the achievement to check
      * @return whether the player has the achievement
      * @throws IllegalArgumentException if achievement is null
+     * @deprecated future versions of Minecraft do not have achievements
      */
+    @Deprecated
     public boolean hasAchievement(Achievement achievement);
 
     /**

paper-api/src/main/java/org/bukkit/event/player/PlayerAchievementAwardedEvent.java

@@ -7,7 +7,9 @@ import org.bukkit.event.HandlerList;
 
 /**
  * Called when a player earns an achievement.
+ * @deprecated future versions of Minecraft do not have achievements
  */
+@Deprecated
 public class PlayerAchievementAwardedEvent extends PlayerEvent implements Cancellable {
     private static final HandlerList handlers = new HandlerList();
     private final Achievement achievement;