Here is the full list of all 20 My Escort Company achievements.
Hire Umi
Hire Sora
Hire Nari
Complete 50 requests!
Hire Chio
One of your girl reached level 3!
Hire Mai
Hire Kanaye
One of your girl reached level 2!
Open a new Area!
Open 10 rewards/Spend 50 stars!
Hire Rini
Purchase an upgrade!
Unlock your first cutscene! Check the Gallery!
Unlock your first special video! Check the Gallery!
Unlock your first pose/outfit! Check the Gallery!
Hire Hayami
Hire Aki
Finish the tutorial!
Create your Escort Company