Here is the full list of all 36 Agent girl achievements.
Get diploma
Fun sister
Graduation gift
The secret in the book
Crush on the boy
Beat the hooligan
Beautiful sister
Shy girl
Harsh instructor
New clothes
Different aesthetic
God-like man
Unaccessible cave
The fun of bathing
Doctor's reminder
Game life
Beautiful horsetail hairstyle
Fainted man
Delicious cake
Eighteen monks array
Repair crystal
Perish together
Seriously paralyzed face
Get listening equipment
Encountered mercenary
Mutant bird man
Japan Make Up Surgery successor
South Korea Cosmetic Surgery successor
Only water
Thai Shemale Surgery successor
Into interstellar
Imprisoned prince
Happy princess
Time-space channel collapse
Become a good agent
Mysterious surprise