Please say the secret code, and then go into the details of the achievement.
1. Let's start with the place shown in the figure below.
2. Then you will find a decorated golden brigade nearby, and then find the following organs.
3. There will be an observation. After observing, click an option in the dialog box, and then go to this woman (follow her around the oasis).
Be careful, don't let her find out, you can fight other gilded brigades.
Then you will get the code word, then go to the office and click to observe, select the code word, and you will get the achievement. Please say the password and enter it.