diff --git a/src/components/ui-showcase/UIShowcaseClient.tsx b/src/components/ui-showcase/UIShowcaseClient.tsx
index a913303..8c32d0d 100644
--- a/src/components/ui-showcase/UIShowcaseClient.tsx
+++ b/src/components/ui-showcase/UIShowcaseClient.tsx
@@ -64,6 +64,7 @@ export function UIShowcaseClient() {
       description: 'Migration vers les composants UI génériques',
       impact: 'high',
       completedAt: new Date(),
+      updatedAt: new Date(),
       tags: ['refactoring', 'ui'],
       todosCount: 8
     },
@@ -73,6 +74,7 @@ export function UIShowcaseClient() {
       description: 'Ajout de 10 nouveaux thèmes avec CSS variables',
       impact: 'medium',
       completedAt: new Date(Date.now() - 86400000),
+      updatedAt: new Date(Date.now() - 86400000),
       tags: ['themes', 'css'],
       todosCount: 3
     }
diff --git a/src/components/ui/AchievementCard.tsx b/src/components/ui/AchievementCard.tsx
index 3218e4c..e068378 100644
--- a/src/components/ui/AchievementCard.tsx
+++ b/src/components/ui/AchievementCard.tsx
@@ -12,6 +12,7 @@ export interface AchievementData {
   description?: string;
   impact: 'low' | 'medium' | 'high';
   completedAt: Date;
+  updatedAt: Date;
   tags?: string[];
   todosCount?: number;
 }
@@ -46,9 +47,12 @@ export function AchievementCard({
           </span>
           <PriorityBadge priority={achievement.impact} />
         </div>
-        <span className="text-xs text-[var(--muted-foreground)]">
-          {format(achievement.completedAt, 'dd/MM', { locale: fr })}
-        </span>
+        <div className="text-xs text-[var(--muted-foreground)] text-right">
+          <div>Terminé: {format(achievement.completedAt, 'dd/MM', { locale: fr })}</div>
+          {achievement.updatedAt && achievement.updatedAt.getTime() !== achievement.completedAt.getTime() && (
+            <div>Mis à jour: {format(achievement.updatedAt, 'dd/MM', { locale: fr })}</div>
+          )}
+        </div>
       </div>
       
       {/* Titre */}
diff --git a/src/services/analytics/manager-summary.ts b/src/services/analytics/manager-summary.ts
index c548121..ef03898 100644
--- a/src/services/analytics/manager-summary.ts
+++ b/src/services/analytics/manager-summary.ts
@@ -42,6 +42,7 @@ export interface KeyAccomplishment {
   tags: string[];
   impact: 'high' | 'medium' | 'low';
   completedAt: Date;
+  updatedAt: Date;
   relatedItems: string[]; // IDs des tâches/checkboxes liées
   todosCount: number; // Nombre de todos associés
 }
@@ -261,6 +262,7 @@ export class ManagerSummaryService {
         tags: task.taskTags?.map(tt => tt.tag.name) || [],
         impact,
         completedAt: task.completedAt || task.updatedAt,
+        updatedAt: task.updatedAt,
         relatedItems: [task.id],
         todosCount: allRelatedTodos // Nombre total de todos associés à cette tâche
       });
@@ -283,6 +285,7 @@ export class ManagerSummaryService {
         tags: [], // Todos standalone n'ont pas de tags par défaut
         impact,
         completedAt: todo.date,
+        updatedAt: todo.date, // Pour les todos, updatedAt = completedAt
         relatedItems: [todo.id],
         todosCount: 1 // Un todo = 1 todo
       });
diff --git a/src/services/task-management/tasks.ts b/src/services/task-management/tasks.ts
index 6397ab6..78be152 100644
--- a/src/services/task-management/tasks.ts
+++ b/src/services/task-management/tasks.ts
@@ -67,15 +67,18 @@ export class TasksService {
     tags?: string[];
     dueDate?: Date;
   }): Promise<Task> {
+    const status = taskData.status || 'todo';
     const task = await prisma.task.create({
       data: {
         title: taskData.title,
         description: taskData.description,
-        status: taskData.status || 'todo',
+        status: status,
         priority: taskData.priority || 'medium',
         dueDate: taskData.dueDate,
         source: 'manual', // Source manuelle
-        sourceId: `manual-${Date.now()}` // ID unique
+        sourceId: `manual-${Date.now()}`, // ID unique
+        // Si créée directement en done/archived, définir completedAt
+        completedAt: (status === 'done' || status === 'archived') ? getToday() : null
       },
       include: {
         taskTags: {
@@ -135,12 +138,16 @@ export class TasksService {
       updatedAt: getToday()
     };
 
-
-    if (updates.status === 'done' && !task.completedAt) {
+    // Logique pour completedAt : date de résolution définitive
+    if (updates.status === 'done') {
+      // Première fois qu'on marque comme done -> définir completedAt
+      updateData.completedAt = getToday();
+    } else if (updates.status === 'archived' && !task.completedAt) {
+      // Première fois qu'on archive -> définir completedAt (archiver = résoudre)
       updateData.completedAt = getToday();
-    } else if (updates.status && updates.status !== 'done' && task.completedAt) {
-      updateData.completedAt = null;
     }
+    // Si elle était déjà done/archived et qu'on change le statut,
+    // on garde la completedAt existante (ne jamais l'effacer)
 
     await prisma.task.update({
       where: { id: taskId },