Here is the full list of all 17 Whispered Promises ~ 14 Days of Love with Anna achievements.
First time playing
Clearing the game for the first time
View Normal Ending
View Player Ending
View Study Ending
View Ero Ending
View True Ending
Knowledge reaches Max
Intimacy reaches Max
Erotic reaches Max
Beat Anna over Lv20 in SMASH
Hold over 200,000 dollars
All status reach Max
Purchase an engagement ring
Rub and touch Anna to your heart's content.
Ask and don't buy several times at Shigure's online shop.
Drink a total of 20 energy drinks