Fixed errors and created endpoint to see locked achievement of selected user

BeReadyBackend/DTO/Achievements/GetAchievementDto.cs

@@ -1,6 +1,6 @@
 namespace BeReadyBackend.DTO.Achievements;
 
-public class GetSuccessDto
+public class GetAchievementDto
 {
     public int Id { get; set; }
     public string? Label { get; set; }