The Sims 4
50 Achievements
1,000
2-3h
I, Spy
Have a Sim reach max level in the Secret Agent career.
20
0.33%
How to unlock the I, Spy achievement in The Sims 4 - Definitive Guide
The Villain branch has an extra promotion so I would personally go for the Diamond one, you also earn almost double per day.
If you need an easy way to level your skills, logic can be done through the chess board which also gives you to Focused moodlet which will help with promotion.
Charisma can be levelled through talking to other sims or more consistently through practising speeches in the mirror.
Mischief can be done through the social branch on other sims, once you reach level 2 I would recommend 'Trolling Teh Forums' as it is a constant flow of experience.
If anyone has anything to add please comment.
There are 7 job titles for the first part
After you get to the "top" of Secret Agent you need to choose between Diamond Agent or Villain
Diamond Agent you need 10 Logic and 8 Charisma. Your daily task will be Romantic Interactions. There's 3 job titles: Sky Captain, Shadow Agent and finally Double Diamond Agent
Villain Branch You need 10 Logic and 6 Mischief. There are 4 job titles. You'll need to use Mischief.
Here's a great guide, thanks to Sims VIP. I had no part in creating it.
https://simsvip.com/the-sims-4-secret-agent-career-guide/
There are two branches for the Secret Agent career: Diamond Agent and Villain. You only need one for the trophy.
Diamond Agent:
Skills Required: Logic Level 10, Charisma Level 8
Daily Tasks: Browse Intelligence (Levels 1,2,4,6, and 7), Friendly Interactions (Levels 3 and 5), Romance Interactions (Levels 8-10)
Recommended Moodlet: Focused
Villain:
Note: It is possible to reach Career Level 11 with this branch, but only Level 10 is required for the trophy.
Skills Required: Logic Level 10, Mischief Level 4 (if stopping at Career Level 10), Mischief Level 6 (if stopping at Career Level 11)
Daily Tasks: Browse Intelligence (Levels 1,2,4,6, and 7), Friendly Interactions (Level 3 and 5), Mischief Interactions (Levels 8-10/11)
Recommended Moodlet: Focused
While at home, you can use the “Focused Painting”, however, you want to be Focused when you actually go to work and for as long as possible while there. The easy way to do this is on the Chess Table. When you get the notification that your carpool will arrive in an hour, choose to “Play Chess” at the Chess Table. This will take about an hour (so you won’t be “late” to work) and will give you the Focused Moodlet for 4 hours. Unfortunately, this is the longest time period available for this Moodlet so it’ll have to do.
Make sure the needs bars for your Sim are all in the green as well. Each promotion will take anywhere between 2-4 days (the latter promotions will take about 4). As soon as you reach Level 10 of either branch, the trophy will unlock.