Qt: Prompt user to enable HC mode on achievement login

src/duckstation-qt/achievementlogindialog.cpp

@@ -75,6 +75,45 @@ void AchievementLoginDialog::processLoginResult(bool result, const QString& mess
     return;
   }
 
+  if (!Host::GetBaseBoolSettingValue("Cheevos", "Enabled", false) &&
+      QMessageBox::question(this, tr("Enable Achievements"),
+                            tr("Achievement tracking is not currently enabled. Your login will have no effect until "
+                               "after tracking is enabled.\n\nDo you want to enable tracking now?"),
+                            QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
+  {
+    Host::SetBaseBoolSettingValue("Cheevos", "Enabled", true);
+    Host::CommitBaseSettingChanges();
+    g_emu_thread->applySettings();
+  }
+
+  if (!Host::GetBaseBoolSettingValue("Cheevos", "ChallengeMode", false) &&
+      QMessageBox::question(
+        this, tr("Enable Hardcore Mode"),
+        tr("Hardcore mode is not currently enabled. Enabling hardcore mode allows you to set times, scores, and "
+           "participate in game-specific leaderboards.\n\nHowever, hardcore mode also prevents the usage of save "
+           "states, cheats and slowdown functionality.\n\nDo you want to enable hardcore mode?"),
+        QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
+  {
+    Host::SetBaseBoolSettingValue("Cheevos", "ChallengeMode", true);
+    Host::CommitBaseSettingChanges();
+    g_emu_thread->applySettings();
+
+    bool has_active_game;
+    {
+      auto lock = Achievements::GetLock();
+      has_active_game = Achievements::HasActiveGame();
+    }
+
+    if (has_active_game &&
+        QMessageBox::question(
+          QtUtils::GetRootWidget(this), tr("Reset System"),
+          tr("Hardcore mode will not be enabled until the system is reset. Do you want to reset the system now?")) ==
+          QMessageBox::Yes)
+    {
+      g_emu_thread->resetSystem();
+    }
+  }
+
   done(0);
 }
 

src/duckstation-qt/achievementsettingswidget.cpp

@@ -210,6 +210,19 @@ void AchievementSettingsWidget::onLoginLogoutPressed()
     return;
 
   updateLoginState();
+
+  // Login can enable achievements/hardcore.
+  if (!m_ui.enable->isChecked() && Host::GetBaseBoolSettingValue("Cheevos", "Enabled", false))
+  {
+    QSignalBlocker sb(m_ui.enable);
+    m_ui.enable->setChecked(true);
+    updateEnableState();
+  }
+  if (!m_ui.hardcoreMode->isChecked() && Host::GetBaseBoolSettingValue("Cheevos", "ChallengeMode", false))
+  {
+    QSignalBlocker sb(m_ui.hardcoreMode);
+    m_ui.hardcoreMode->setChecked(true);
+  }
 }
 
 void AchievementSettingsWidget::onViewProfilePressed()