diff --git a/src/app/api/gamification/achievements/route.ts b/src/app/api/gamification/achievements/route.ts
index a04e2f5b0..e58567730 100644
--- a/src/app/api/gamification/achievements/route.ts
+++ b/src/app/api/gamification/achievements/route.ts
@@ -531,7 +531,8 @@ export const GET = apiHandler(async (request: NextRequest) => {
               "auth.login.password",
               "bugreport.submit",
               // v1.4.18 — hidden Easter-egg triggers
-              "doctor-report.export",
+              "doctor-report.generate",
+              "doctor-report.pdf.generate",
               "settings.locale.update",
             ],
           },
diff --git a/src/lib/auth/profile-update.ts b/src/lib/auth/profile-update.ts
index 03c0de7c3..07391127d 100644
--- a/src/lib/auth/profile-update.ts
+++ b/src/lib/auth/profile-update.ts
@@ -86,6 +86,21 @@ export async function applyProfileUpdate(
   if (data.locale !== undefined) updates.locale = data.locale;
   if (data.timezone !== undefined) updates.timezone = data.timezone;
 
+  // v1.4.18 — capture the prior locale so we can emit a separate
+  // `settings.locale.update` audit row when the locale actually
+  // changes. The hidden "polyglot" achievement watches that action,
+  // and we don't want to fire it on profile updates that happen to
+  // touch other fields.
+  const priorLocale =
+    data.locale !== undefined
+      ? (
+          await prisma.user.findUnique({
+            where: { id: userId },
+            select: { locale: true },
+          })
+        )?.locale ?? null
+      : null;
+
   const updatedUser = await prisma.user.update({
     where: { id: userId },
     data: updates,
@@ -96,6 +111,14 @@ export async function applyProfileUpdate(
     ipAddress: ipAddress ?? null,
   });
 
+  if (data.locale !== undefined && priorLocale !== data.locale) {
+    await auditLog("settings.locale.update", {
+      userId: updatedUser.id,
+      ipAddress: ipAddress ?? null,
+      details: { from: priorLocale, to: data.locale ?? null },
+    });
+  }
+
   return {
     ok: true,
     user: {
diff --git a/src/lib/gamification/__tests__/expansion-metrics.test.ts b/src/lib/gamification/__tests__/expansion-metrics.test.ts
index f6b3ff7ab..ab71c28e4 100644
--- a/src/lib/gamification/__tests__/expansion-metrics.test.ts
+++ b/src/lib/gamification/__tests__/expansion-metrics.test.ts
@@ -235,8 +235,9 @@ describe("getHiddenMetrics", () => {
       moodEntries: [],
       intakeEvents: [],
       auditEvents: [
-        { action: "doctor-report.export", createdAt: new Date() },
-        { action: "doctor-report.export", createdAt: new Date() },
+        // The route's auditLog filter accepts both `generate` actions.
+        { action: "doctor-report.generate", createdAt: new Date() },
+        { action: "doctor-report.pdf.generate", createdAt: new Date() },
         { action: "settings.locale.update", createdAt: new Date() },
         { action: "auth.login.passkey", createdAt: new Date() }, // ignored
       ],
diff --git a/src/lib/gamification/expansion-metrics.ts b/src/lib/gamification/expansion-metrics.ts
index 6157b5e30..899135d72 100644
--- a/src/lib/gamification/expansion-metrics.ts
+++ b/src/lib/gamification/expansion-metrics.ts
@@ -276,7 +276,16 @@ export function getHiddenMetrics(input: {
   let doctorPdfCount = 0;
   let localeFlipCount = 0;
   for (const ev of input.auditEvents) {
-    if (ev.action === "doctor-report.export") doctorPdfCount += 1;
+    // Both "generate" + "pdf.generate" count — the PDF route emits the
+    // latter; the JSON-only generate route emits the former. We accept
+    // either as the trigger so the badge fires the first time the user
+    // exercises the doctor-report feature in any shape.
+    if (
+      ev.action === "doctor-report.generate" ||
+      ev.action === "doctor-report.pdf.generate"
+    ) {
+      doctorPdfCount += 1;
+    }
     if (ev.action === "settings.locale.update") localeFlipCount += 1;
   }
 
diff --git a/tests/integration/achievements-expansion.test.ts b/tests/integration/achievements-expansion.test.ts
index 3c15aec35..5a5c36d35 100644
--- a/tests/integration/achievements-expansion.test.ts
+++ b/tests/integration/achievements-expansion.test.ts
@@ -159,12 +159,12 @@ describe("achievements expansion — fresh user, real prisma rows", () => {
     await prisma.auditLog.create({
       data: {
         userId: user.id,
-        action: "doctor-report.export",
+        action: "doctor-report.pdf.generate",
       },
     });
 
     const auditEvents = await prisma.auditLog.findMany({
-      where: { userId: user.id, action: "doctor-report.export" },
+      where: { userId: user.id, action: "doctor-report.pdf.generate" },
       select: { action: true, createdAt: true },
     });