PJ/Assets/scripts/CheckAchievements.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class CheckAchievements : MonoBehaviour
{
    public List<int> HaveAchievements;
    public Image[] AchivementId;
    public Sprite Lock;
    public void Load()
    {
        if (PlayerPrefs.HasKey("HaveA"))
        {
            string json = PlayerPrefs.GetString("HaveA");
            HaveAchievements = JsonUtility.FromJson<Serialization<int>>(json).List;
        }
        else
        {
            Debug.Log(HaveAchievements);
        }
    }
    private class Serialization<T>
    {
        public List<T> List;

        public Serialization(List<T> list)
        {
            this.List = list;
        }

        public List<T> ToList()
        {
            return List;
        }
    }

    private void Update()
    {
        Load();
        for(int i = 0; i < 18; i++)
        {
            if (!HaveAchievements.Contains(i))
            {
                AchivementId[i].sprite = Lock;
                AchivementId[i].transform.localScale = new Vector3(0.8f, 0.8f);
            } 
        }
    }
}