Created repository

.gitignore

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+/bin
+/lib
+/obj
+UltraAchievement Core.sln

Achievement.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+using UltraAchievement;
+
+public class Achievement : MonoBehaviour
+{
+    private float endTimer = 0;
+    private float startTimer = 0;
+    private float animTimer;
+    private bool endTimerStarted = false;
+    private bool startTimerStarted = false;
+    private RectTransform rect;
+    private Image icon;
+    private Text title,description;
+
+    public void InitAchievement(string iconPath, string name = "Achievement", string desc = "Example description")
+    {
+        rect = GetComponent<RectTransform>();
+        title = transform.GetChild(0).GetComponent<Text>();
+        description = transform.GetChild(1).GetComponent<Text>();
+        icon = transform.GetChild(2).GetComponent<Image>();
+        title.text = name;
+        description.text = desc;
+        icon.sprite = Core.LoadSprite(iconPath,Vector4.zero,100);
+        rect.anchoredPosition = new Vector2(400,0);
+        startTimerStarted = true;
+    }
+    public void InitAchievementI(Sprite ico, string name = "Achievement", string desc = "Example description")
+    {
+        rect = GetComponent<RectTransform>();
+        title = transform.GetChild(0).GetComponent<Text>();
+        description = transform.GetChild(1).GetComponent<Text>();
+        icon = GetComponentInChildren<Image>();
+        title.text = name;
+        description.text = desc;
+        icon.sprite = ico;
+        rect.anchoredPosition = new Vector2(400,0);
+        startTimerStarted = true;
+    }
+    void Update()
+    {
+        if(startTimerStarted)
+        {
+            startTimer += Time.deltaTime;
+            animTimer += Time.deltaTime * 1.35f;
+            if (animTimer >= 1) animTimer = 1;
+            rect.anchoredPosition = new Vector2(Mathf.Lerp(400f, 0f, animTimer),0);
+            if(startTimer >= 5)
+            {
+                animTimer = 0;
+                endTimerStarted = true;
+                startTimerStarted = false;
+            }
+        }
+        if(endTimerStarted)
+        {
+            endTimer += Time.deltaTime;
+            animTimer += Time.deltaTime * 1.35f;
+            if (animTimer >= 1) animTimer = 1;
+            rect.anchoredPosition = new Vector2(Mathf.Lerp(0f, 400f, animTimer), 0);
+            if (endTimer >= 5)
+            {
+                endTimerStarted = false;
+                Destroy(this.gameObject);
+            }
+        }
+    }
+}

NuGet.Config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <add key="BepInEx" value="https://nuget.bepinex.dev/v3/index.json" />
+  </packageSources>
+</configuration>

Plugin.cs

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+using BepInEx;
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using UnityEngine;
+using UnityEngine.UI;
+using System.Linq;
+
+namespace UltraAchievement
+{
+    [BepInPlugin("zeddev.ultraachievement.core", "ultraAchievement Core", "1.0.0")]
+    public class Core : BaseUnityPlugin
+    {
+        public static Core current;
+        private static string path;
+        private static List<string> obtainedAchievements = new List<string>(); 
+        private GameObject overlay;
+        private GameObject achievementTemplate;
+        private void Awake()
+        {
+            current = this;
+            path = $"{Application.persistentDataPath}\\achievements.uaf";
+            if(File.Exists(path))
+            {
+                obtainedAchievements = GetAchievements();
+            }
+            else File.Create(path);
+            // For testing purposes only
+            //UnityEngine.SceneManagement.SceneManager.sceneLoaded += Scene;
+            Logger.LogInfo($"Loaded UltraAchievement core");
+            overlay = CreateOverlay();
+            achievementTemplate = CreateTemplate();
+
+        }
+
+        public static void ShowAchievement(string iconPath, string name = "Achievement", string desc = "Example description")
+        {
+            if(!HasAchievement(name))
+            {
+                AddAchievement(name);
+                GameObject achievement = CreateTemplate();
+                achievement.GetComponent<RectTransform>().SetParent(current.overlay.GetComponent<RectTransform>());
+                achievement.GetComponent<Achievement>().InitAchievement(iconPath,name,desc);
+            }
+        }
+        public static void ShowAchievement(Sprite icon, string name = "Achievement", string desc = "Example description")
+        {
+            if(!HasAchievement(name))
+            {
+                AddAchievement(name);
+                GameObject achievement = CreateTemplate();
+                achievement.GetComponent<RectTransform>().SetParent(current.overlay.GetComponent<RectTransform>());
+                achievement.GetComponent<Achievement>().InitAchievementI(icon,name,desc);
+            }
+        }
+        void Scene(UnityEngine.SceneManagement.Scene scene, UnityEngine.SceneManagement.LoadSceneMode loadSceneMode)
+        {
+            if(scene.name.Contains("Menu"))
+            {
+                Logger.LogInfo("In Menu");
+                ShowAchievement($"{Directory.GetCurrentDirectory()}\\BepInEx\\UKMM Mods\\UKUIHelper-v0.7.0\\Sprites\\Sprite.png", "Ultrakillin' Time", "Open Ultrakill");
+            }
+        }
+
+        public static GameObject CreateTemplate()
+        {
+            GameObject blank = CreatePanel();
+            blank.name = "Achievement";
+            blank.AddComponent<Achievement>();
+            blank.transform.position = new Vector3(1000,1000);
+
+            GameObject title = CreateText();
+            title.name = "Title";
+            RectTransform rect = title.GetComponent<RectTransform>();
+            rect.SetParent(blank.GetComponent<RectTransform>());
+            rect.SetAnchor(AnchorPresets.TopLeft);
+            rect.SetPivot(PivotPresets.TopLeft);
+            rect.anchoredPosition = new Vector2(0,0);
+            rect.sizeDelta = new Vector2(300,25);
+            title.GetComponent<Text>().text = "Title";
+            title.GetComponent<Text>().fontSize = 20;
+            title.GetComponent<Text>().fontStyle = FontStyle.Bold;
+
+            GameObject desc = CreateText();
+            desc.name = "Description";
+            rect = desc.GetComponent<RectTransform>();
+            rect.SetParent(blank.GetComponent<RectTransform>());
+            rect.SetAsLastSibling();
+            rect.SetAnchor(AnchorPresets.TopLeft);
+            rect.SetPivot(PivotPresets.TopLeft);
+            rect.anchoredPosition = new Vector2(0,-25);
+            rect.sizeDelta = new Vector2(300,75);
+            desc.GetComponent<Text>().text = "Description";
+            desc.GetComponent<Text>().fontSize = 18;
+
+            GameObject icon = CreateImage();
+            icon.name = "Icon";
+            rect = icon.GetComponent<RectTransform>();
+            rect.SetParent(blank.GetComponent<RectTransform>());
+            rect.SetAsLastSibling();
+            rect.anchoredPosition = new Vector2(-100,0);
+            return blank;
+        }
+
+        private static bool HasAchievement(string name)
+        {
+            if(obtainedAchievements.Contains(name))
+            {
+                return true;
+            }
+            else return false;
+        }
+        private static void AddAchievement(string name)
+        {
+            obtainedAchievements.Add(name);
+            File.WriteAllLines(path,obtainedAchievements);
+        }
+        private List<string> GetAchievements()
+        {
+            List<string> achievements = File.ReadAllLines(path).ToList<string>();
+            return achievements;
+        }
+
+        // Please ignore all the shit below this comment :D
+
+        private static GameObject CreateOverlay()
+        {
+            GameObject blank = new GameObject();
+            blank.name = "Achievement Overlay";
+            blank.AddComponent<Canvas>();
+            blank.GetComponent<Canvas>().renderMode = RenderMode.ScreenSpaceOverlay;
+            blank.GetComponent<Canvas>().sortingOrder = 1000;
+            blank.AddComponent<CanvasScaler>();
+            blank.AddComponent<GraphicRaycaster>();
+            blank.GetComponent<CanvasScaler>().screenMatchMode = CanvasScaler.ScreenMatchMode.MatchWidthOrHeight;
+            blank.GetComponent<CanvasScaler>().matchWidthOrHeight = 0f;
+            blank.GetComponent<CanvasScaler>().referenceResolution = new Vector2(1920,1080);
+            DontDestroyOnLoad(blank);
+            return blank;
+        }
+        private static GameObject CreatePanel()
+        {
+            GameObject blank = CreateImage();
+            blank.name = "Panel";
+            RectTransform rect = blank.GetComponent<RectTransform>();
+            rect.sizeDelta = new Vector2(250,100);
+            rect.SetAnchor(AnchorPresets.BottomRight);
+            rect.SetPivot(PivotPresets.BottomRight);
+            blank.GetComponent<Image>().color = new Color(0.2745f,0.2745f,0.3529f,1f);
+            return blank;
+        }
+        private static GameObject CreateImage()
+        {
+            GameObject blank = new GameObject();
+            blank.name = "Image";
+            blank.AddComponent<RectTransform>();
+            RectTransform rect = blank.GetComponent<RectTransform>();
+            blank.AddComponent<CanvasRenderer>();
+            rect.sizeDelta = new Vector2(100,100);
+            rect.SetAnchor(AnchorPresets.TopLeft);
+            rect.SetPivot(PivotPresets.TopLeft);
+            blank.AddComponent<Image>();
+            return blank;
+        }
+        private static GameObject CreateText()
+        {
+            GameObject blank = new GameObject();
+            blank.name = "Text";
+            blank.AddComponent<RectTransform>();
+            blank.AddComponent<CanvasRenderer>();
+            RectTransform rect = blank.GetComponent<RectTransform>();
+            rect.sizeDelta = new Vector2(500, 50);
+            rect.SetAnchor(AnchorPresets.MiddleCenter);
+            rect.SetPivot(PivotPresets.MiddleCenter);
+            blank.AddComponent<Text>();
+            blank.GetComponent<Text>().text = "Text";
+            blank.GetComponent<Text>().font = Font.GetDefault();
+            blank.GetComponent<Text>().fontSize = 30;
+            blank.GetComponent<Text>().alignment = TextAnchor.UpperLeft;
+            blank.GetComponent<Text>().color = Color.white;
+            return blank;
+        }
+        public static Sprite LoadSprite(string path, Vector4 border, float pixelsPerUnit)
+        {
+            Texture2D texture = new Texture2D(200, 200);
+            texture.LoadImage(File.ReadAllBytes(path));
+            return Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0.5f, 0.5f), pixelsPerUnit, 0, SpriteMeshType.Tight, border);
+        }
+    }
+
+}