In RUBATO, achievements do not unlock unless overlay is enabled #578

Describe the bug
If the experimental overlay isn't enabled, nothing happens when I unlock an achievement, it isn't saved to achievements.json. Enabling the overlay fixes the problem. I have only experienced this issue in RUBATO.

Emulator version
Attached logs were created using Release 2026 07 19 emu-win-debug.7z experimental steam_api64.dll

Debug log
steam_settings (overlay disabled) and logs: https://drive.google.com/file/d/1nFSz9Epa-kgBYw8l_bc6VSbfyl6cRPQ0/view?usp=sharing

steam_settings file
steam_settings (overlay disabled) and logs: https://drive.google.com/file/d/1nFSz9Epa-kgBYw8l_bc6VSbfyl6cRPQ0/view?usp=sharing

Infos
The game SteamAppId: 2244030
The game using Denuvo: No

Requirement

• I am uploaded debug log.
• I am uploaded steam_setting file.
• I am sure the game not using 3rd party server (Photon, Playfab, GC, etc).
• I am sure can run the game offline.

To Reproduce
Steps to reproduce the behavior:

1. Keep the experimental overlay disabled
2. Start the game
3. Get to the first achievement by completing the tutorial and starting the first area
4. Nothing happens, achievement doesn't unlock

Expected behavior
Disabling or enabling the overlay shouldn't affect achievement unlocks since the overlay is just a visual extra.