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