Here is the full list of all 15 Love n Dream achievements.
Complete the first level
Complete Misatsune's story
Complete Tofumi's story
Complete Tamami's story
Complete Yasuna's story
Complete Maritsuki's story
Complete Honatsu's story
Complete Inomi's story
Record your first heart
Obtain 30 or more hearts
Obtain all hearts
Record your first collectible item
Obtain 20 or more collectible items
Obtain all collectible items
Poke 200 times