Step 1: Find the three notes in the following missions (locations in the video down below)
- Brick in the wall (at
0:38)
- Echoes of a cold war (at
0:55)
- Desperate Measures (at
1:26)
Step 2: Select the mission
Operation Red Circus and read each note. Write down the following information about each person. Be aware that the locations and gender might not be the same for you.
first note: name (bearded lady/strong man/juggler) & travel location (city, country + date)
-> each section describes an agent
second note: travel location (city, country + date)
-> each section describes the travel locations they visited
third note: sex (male/female)
-> each section describes the gender of the agent
Step 4: Identify the three agents from the list. Simply compare their profiles with your list and select the three matching people.
Step 5: Complete the mission. After completing the achievement should pop up. Difficulty does not matter.
Note:As mentioned in the comments by @Reqqu you can just choose and suspect any three agents and complete the mission to pop up the achievement. You only won't receive the player card for choosing the correct agents. And be aware that there might be multiple spawn locations for the note in the mission "Desperate measures" - for me it was the one shown in the video.
After completing and back in the room again you will receive a notification in the top right corner that you successfully identified all three agents and completed the challenge, what unlocks a player card for you:
Multiplayer section -> Challenges -> Campaign -> Story -> Loyal Agent -> Reward: Player Card
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My list looked like this (I am playing in german, tried to translate it for you):
bearded lady: male
Kopenhagen, Dänemark at 04.12.80 | Krakau, Polen at 04.10.80
strong man: female
Paris, Frankreich at 21.01.81 | Barcelona, Spanien at 09.01.80
juggler: male
Cambrige, England at 23.10.80 | Ost-Berlin, Deutschland at 16.09.80
Hope this helps you out getting the achievement.
Regards,
JanSH4DOW