Simple achievement system, i almost got a cancer when I saw achievements snippet done like c.crabsKilled > value USE THE GODDAM ARRAYS ~ CREDITS TO FUZENSETH OF RUNELOCUS 4 THIS GUIDE.

    package server.model.players.content.achievement;



import server.model.players.Client;

import server.model.players.plugin.impl.ColoredMessage.Colours;

/**

 * @author FUZENSETH

 */

public class Achievement {



	private Client player;

	

	private static final int GRAPHICS = 199;

	

	public Achievement(Client player) {

		this.player = player;

	}

	

	/**

	 *     [MENTION=75098]Para[/MENTION]m player - to player

	 *     [MENTION=75098]Para[/MENTION]m title - title of the achievement 

	 *     [MENTION=75098]Para[/MENTION]m achievementIndex - achievement id

	 *     [MENTION=75098]Para[/MENTION]m points - how many points player gets

	 *     [MENTION=75098]Para[/MENTION]m rewardItems items from the achievement

	 */

	public void append(String title, int achievementIndex, int points, 

			int slotsNeeded, final int... rewardItems) {

		if (player.achievement[achievementIndex] == 0) {

		player.achievementPoints += points;

		complete(title, achievementIndex);

		player.gfx100(GRAPHICS);

		if (!(rewardItems[0] == 0) || !(rewardItems[0] == -1)) {

				addItemReward(slotsNeeded, rewardItems);

				return;

			}

		}

	}

	

	/**

	 * If the player has finished the achievement and has the given stage.

	 *     [MENTION=75098]Para[/MENTION]m index

	 *     [MENTION=75098]Para[/MENTION]m stage

	 *     [MENTION=184045]return[/MENTION]

	 */

	public boolean hasFinished(int index, int stage) {

		return player.achievement[index] == stage;	

	}

	

	/**

	 * Creates the tab

	 */

	public void doTab() {

		

	}

	

	/**

	 * Completes a achievement.

	 *     [MENTION=75098]Para[/MENTION]m achievement

	 *     [MENTION=75098]Para[/MENTION]m index index (id)

	 */

	public void complete(String achievement, int index) {

		player.achievement[index] = 1;

		player.sendMessage("Congratulations, you have completed "+achievement+" achievement.", Colours.ORANGE);

	}



	/**

	 * Adds a item reward.

	 *     [MENTION=75098]Para[/MENTION]m slotsNeeded

	 *     [MENTION=75098]Para[/MENTION]m items...

	 */

	public void addItemReward(int slotsNeeded, final int... items) {

		for (int totalItems = 0; totalItems < items.length; totalItems++) {

	if (!(player.getItems().freeSlots() > slotsNeeded - 1)) 

			player.getItems().addItemToBank(items[totalItems], 1);

	 else

		player.getItems().addItem(items[totalItems], 1);

	}

		if (!(player.getItems().freeSlots() > slotsNeeded - 1))

			player.sendMessage("Your achievement reward(s) was added to your bank account.", Colours.RED);

			else

		player.sendMessage("Your achievement reward(s) has been added to your inventory.", Colours.RED);

	}

}

Client.java

    private Achievement achievements = new Achievement(this);

    	public Achievement getAchievements() {

		return achievements;

	}

AchievementConfiguration.java

    package server.model.players.content.achievement;

/**

 * @author FUZENSETH

 */

public class AchievementConfiguration {



         //Achievements enabled? true:false         

         public static final boolean ENABLED = true;



         //The total achievements that are in use.

	public static final int TOTAL_ACHIEVEMENTS = 50;



}

Player.java

    

	public int achievement[] = new int[AchievementConfiguration.TOTAL_ACHIEVEMENTS];

How to complete a achievement?

param1 - client
param2 - name of the achievement
param3 - achievement id
param4 - inventory slots needed
param5 - items... e.g 11694,11732,11696

    

c.getAchievements().append(c, "Lumberjack", 0, 4, 3, 11694,11283,1175;

What you're adding:

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In this picture I did not have enough inventory slots so my achievement rewards was banked.
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You have to parse the integer array achievement on playersave