[XAM] Fixed issue with lack of loaded achievements while switching profile in-game

src/xenia/kernel/xam/achievement_backends/gpd_achievement_backend.cc

@@ -72,6 +72,10 @@ bool GpdAchievementBackend::IsAchievementUnlocked(
   const auto achievement =
       GetAchievementInfoInternal(xuid, title_id, achievement_id);
 
+  if (!achievement) {
+    return false;
+  }
+
   return (achievement->flags &
           static_cast<uint32_t>(AchievementFlags::kAchieved)) != 0;
 }

src/xenia/kernel/xam/profile_manager.cc

@@ -314,6 +314,15 @@ void ProfileManager::Login(const uint64_t xuid, const uint8_t user_index,
 
   logged_profiles_[assigned_user_slot] =
       std::make_unique<UserProfile>(xuid, &profile);
+
+  if (kernel_state_->emulator()->is_title_open()) {
+    const kernel::util::XdbfGameData db = kernel_state_->title_xdbf();
+    if (db.is_valid()) {
+      kernel_state_->xam_state()->achievement_manager()->LoadTitleAchievements(
+          xuid, db);
+    }
+  }
+
   if (notify) {
     kernel_state_->BroadcastNotification(kXNotificationIDSystemSignInChanged,
                                          GetUsedUserSlots().to_ulong());