If you are wondering that you have liberated the Holland Valley area (John's Region) and checking the mission status stuck at 51/52, no need to worry. There is a hidden mission located near the Northern part in this region.
No Means No
Follow the steps below or watch the video tutorial:
- Head toward the YES Sign in Northern part of Holland Valley.
- Equip yourself as such that you can destroy that Sign.
- Initiate to destroy the sign which will pop up the mission name "No Means No" which you can track now.
- Destroy the Sign completely as stated in the mission description which will lead to its completion.
Now you have successfully completed the remaining hidden mission in this region!