update

app/Models/Achievement.php

@@ -0,0 +1,46 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use App\Models\UserAchievement;
+
+class Achievement extends Model
+{
+    use HasFactory;
+
+    protected $fillable = [
+        'name',
+        'slug',
+        'description',
+        'icon',
+        'xp_reward',
+        'type',
+        'condition_type',
+        'condition_value',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'xp_reward' => 'integer',
+            'condition_value' => 'integer',
+        ];
+    }
+
+    public function userAchievements(): HasMany
+    {
+        return $this->hasMany(UserAchievement::class, 'achievement_id');
+    }
+
+    public function users(): BelongsToMany
+    {
+        return $this->belongsToMany(User::class, 'user_achievements', 'achievement_id', 'user_id')
+            ->withPivot('unlocked_at');
+    }
+}