Here is the full list of all 12 Yumeutsutsu Re:After achievements.
Selected every choice in the game.
Selected every choice in Honoka's route.
Cleared Banako's ending.
Viewed every ending.
Cleared Honoka's ending.
Selected every choice in Marie's route.
Cleared Marie's ending.
Selected every choice in Nana's route.
Cleared Nana's ending.
Cleared Saki's ending.
Selected every choice in Kokoro's route.
Cleared Kokoro's ending.