Here is the full list of all 14 Becoming achievements.
Make the wrong choice.
Forget about the shortcut.
Ignore her plea.
Do not be a gentleman.
Confront her.
Try and convince her.
Enjoy the wakame.
Use her first name.
Do not eat.
Tease her.
Open the box.
Let your heart speak.
Get the door.
Do what is right.