diff --git a/SurveyBackend/SurveyBackend.API/Controllers/CompletionController.cs b/SurveyBackend/SurveyBackend.API/Controllers/CompletionController.cs
index 72a8fda..cae1bc9 100644
--- a/SurveyBackend/SurveyBackend.API/Controllers/CompletionController.cs
+++ b/SurveyBackend/SurveyBackend.API/Controllers/CompletionController.cs
@@ -26,14 +26,18 @@ public class CompletionController : ControllerBase
     [Authorize]
     public async Task<IActionResult> GetCompletionsAsync(int surveyId)
     {
-        return NotFound();
+        var models = await _completionService.GetCompletionsBySurveyIdAsync(surveyId);
+        var result = models.Select(CompletionMapper.ModelToOutputDto);
+        return Ok(result);
     }
 
     [HttpGet("{id:int}")]
     [Authorize]
     public async Task<IActionResult> GetCompletionAsync(int id)
     {
-        return NotFound();
+        var model = await _completionService.GetCompletionByIdAsync(id);
+        var result = CompletionMapper.ModelToOutputDto(model);
+        return Ok(result);
     }
 
     [HttpPost]
diff --git a/SurveyBackend/SurveyBackend.API/DTOs/Completion/CompletionOutputDto.cs b/SurveyBackend/SurveyBackend.API/DTOs/Completion/CompletionOutputDto.cs
index 0514242..d546267 100644
--- a/SurveyBackend/SurveyBackend.API/DTOs/Completion/CompletionOutputDto.cs
+++ b/SurveyBackend/SurveyBackend.API/DTOs/Completion/CompletionOutputDto.cs
@@ -4,7 +4,8 @@ namespace SurveyBackend.DTOs.Completion;
 
 public class CompletionOutputDto
 {
+    public int Id { get; set; }
+    public int SurveyId { get; set; }
     public int? CompletedBy { get; set; }
     public DateTime FinishedAt { get; set; }
-    public List<AnswerOutputDto> Answers { get; set; }
 }
\ No newline at end of file
diff --git a/SurveyBackend/SurveyBackend.API/Mappers/CompletionMapper.cs b/SurveyBackend/SurveyBackend.API/Mappers/CompletionMapper.cs
index 9596947..3eb1edf 100644
--- a/SurveyBackend/SurveyBackend.API/Mappers/CompletionMapper.cs
+++ b/SurveyBackend/SurveyBackend.API/Mappers/CompletionMapper.cs
@@ -14,8 +14,9 @@ public static class CompletionMapper
 
     public static CompletionOutputDto ModelToOutputDto(Completion model) => new CompletionOutputDto
     {
+        Id = model.Id,
+        SurveyId = model.SurveyId,
         CompletedBy = model.CompletedBy,
-        FinishedAt = model.FinishedAt,
-        Answers = model.Answers.Select(AnswerMapper.ModelToOutputDto).ToList(),
+        FinishedAt = model.FinishedAt
     };
 }
\ No newline at end of file
diff --git a/SurveyBackend/SurveyBackend.Services/Services/CompletionService.cs b/SurveyBackend/SurveyBackend.Services/Services/CompletionService.cs
index 8d2e633..655c9dd 100644
--- a/SurveyBackend/SurveyBackend.Services/Services/CompletionService.cs
+++ b/SurveyBackend/SurveyBackend.Services/Services/CompletionService.cs
@@ -1,3 +1,4 @@
+using SurveyBackend.Services.Exceptions;
 using SurveyLib.Core.Models;
 using SurveyLib.Core.Repositories;
 using SurveyLib.Core.Services;
@@ -31,6 +32,17 @@ public class CompletionService : ICompletionService
         await _completionRepository.DeleteAsync(id);
     }
 
+    public async Task<Completion> GetCompletionByIdAsync(int id)
+    {
+        var completion = await _completionRepository.GetByIdAsync(id);
+        if (completion is null)
+        {
+            throw new NotFoundException("Completion not found");
+        }
+
+        return completion;
+    }
+
     public async Task<IEnumerable<Completion>> GetCompletionsBySurveyIdAsync(int surveyId)
     {
         // TODO: проверить существование опроса