Here is the full list of all 18 No One But You achievements.
Ryo Good end
Self explanatory
Why would you do that to Yui
The most important achievement, Ryo lap pillow.
Shiro Good end
Shiro Bad end
Yui Good end
Yui Bad end
Megumi Good end
Megumi Bad end
Why Megumi?
Received the second greatest honor....
A gentle embrace
Chinatsu Good end
A starry night, only for the two of us.
You met the white haired girl on the roof.
Good job, you started the game....