Here is the full list of all 35 C14 Dating achievements.
Unlock Alone Ending CG
Unlock Group Photo CG
Unlock Chantal Nails Chibi
Unlock Sea Snails Chibi scene
Unlock Dancing Joan scene
Unlock Hendrik Friendship Chibi
Unlock Kyler Friendship Chibi
Unlock Dancing Kyler scene
Unlock Deandre Friendship Chibi
Unlock Deandre Love CG
Unlock Shoji Friendship Chibi
Unlock Joan Love CG
Unlock Joan Friendship Chibi
Unlock Joan Snails Chibi scene
Unlock Rosemarie Festival CG
Unlock Festival Joan scene
Unlock Joan Flute Chibi scene
Unlock Hendrik Love CG
Unlock Hendrik Week 7 CG
Unlock Dancing Hendrik scene
Unlock Hendrik Festival scene
Unlock Shoji Love CG
Unlock Shoji Week 7 CG
Unlock Shoji Week 7 Chibi
Unlock Dancing Shoji scene
Unlock Shoji Festival scene
Unlock Deandre Week 7 CG
Unlock Deandre Week 7 Chibi
Unlock Dancing Deandre scene
Unlock Deandre Festival scene
Unlock Kyler Love CG
Unlock Kyler Week 7 CG
Unlock Kyler Week 7 Chibi
Unlock Kyler Festival scene
Unlock Deandre-Kyler Festival Chibi