diff --git a/locales/index.d.ts b/locales/index.d.ts
index 18404d5571..995bca9cff 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -1612,6 +1612,10 @@ export interface Locale {
                 "title": string;
                 "description": string;
             };
+            "_tutorialCompleted": {
+                "title": string;
+                "description": string;
+            };
         };
     };
     "_role": {
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index a5d95f13ae..420b538a4a 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -1524,6 +1524,9 @@ _achievements:
     _smashTestNotificationButton:
       title: "テスト過剰"
       description: "通知のテストをごく短時間のうちに連続して行った"
+    _tutorialCompleted:
+      title: "Misskey初心者講座 修了証"
+      description: "チュートリアルを完了した"
 
 _role:
   new: "ロールの作成"
diff --git a/packages/backend/src/core/AchievementService.ts b/packages/backend/src/core/AchievementService.ts
index 1b8718335b..88fc033859 100644
--- a/packages/backend/src/core/AchievementService.ts
+++ b/packages/backend/src/core/AchievementService.ts
@@ -86,6 +86,7 @@ export const ACHIEVEMENT_TYPES = [
 	'cookieClicked',
 	'brainDiver',
 	'smashTestNotificationButton',
+	'tutorialCompleted',
 ] as const;
 
 @Injectable()
diff --git a/packages/frontend/src/components/MkTutorialDialog.vue b/packages/frontend/src/components/MkTutorialDialog.vue
index 54ffb0911e..e28838425f 100644
--- a/packages/frontend/src/components/MkTutorialDialog.vue
+++ b/packages/frontend/src/components/MkTutorialDialog.vue
@@ -148,7 +148,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref, shallowRef } from 'vue';
+import { ref, shallowRef, watch } from 'vue';
 import MkModalWindow from '@/components/MkModalWindow.vue';
 import MkButton from '@/components/MkButton.vue';
 import XNote from '@/components/MkTutorialDialog.Note.vue';
@@ -159,6 +159,7 @@ import MkAnimBg from '@/components/MkAnimBg.vue';
 import { i18n } from '@/i18n.js';
 import { instance } from '@/instance.js';
 import { host } from '@/config.js';
+import { claimAchievement } from '@/scripts/achievements.js';
 import * as os from '@/os.js';
 
 const props = defineProps<{
@@ -174,6 +175,13 @@ const dialog = shallowRef<InstanceType<typeof MkModalWindow>>();
 // eslint-disable-next-line vue/no-setup-props-destructure
 const page = ref(props.initialPage ?? 0);
 
+watch(page, (to) => {
+	// チュートリアルの枚数を増やしたら必ず変更すること！！
+	if (to === 6) {
+		claimAchievement('tutorialCompleted');
+	}
+});
+
 const isReactionTutorialPushed = ref<boolean>(false);
 const isSensitiveTutorialSucceeded = ref<boolean>(false);
 
diff --git a/packages/frontend/src/scripts/achievements.ts b/packages/frontend/src/scripts/achievements.ts
index af7c6b060c..e7585fcf81 100644
--- a/packages/frontend/src/scripts/achievements.ts
+++ b/packages/frontend/src/scripts/achievements.ts
@@ -82,6 +82,7 @@ export const ACHIEVEMENT_TYPES = [
 	'cookieClicked',
 	'brainDiver',
 	'smashTestNotificationButton',
+	'tutorialCompleted',
 ] as const;
 
 export const ACHIEVEMENT_BADGES = {
@@ -460,6 +461,11 @@ export const ACHIEVEMENT_BADGES = {
 		bg: 'linear-gradient(0deg, rgb(187 183 59), rgb(255 143 77))',
 		frame: 'bronze',
 	},
+	'tutorialCompleted': {
+		img: '/fluent-emoji/1f393.png',
+		bg: 'linear-gradient(0deg, rgb(220 223 225), rgb(172 192 207))',
+		frame: 'bronze',
+	},
 /* @see <https://github.com/misskey-dev/misskey/pull/10365#discussion_r1155511107>
 } as const satisfies Record<typeof ACHIEVEMENT_TYPES[number], {
 	img: string;