Here is the full list of all 20 HuniePop 2: Double Date achievements.
Select the "bottom" reward from Kyu for saving the universe.
Select the "top" reward from Kyu for saving the universe.
Collect enough fairy wings to summon the Nymphojinn within 15 in-game days.
Earn a 100% completion rate.
Earn a 100% completion rate on Incel/Femcel (Hard) difficulty.
Successfully complete 24 Alpha Mode dates.
Earn 5000 or more affection from a single token match.
Successfully complete 8 Alpha Mode dates.
Submit the secret code that unlocks this hidden achievement.
Successfully complete a Non-Stop date of 8 or more rounds.
Successfully complete a Non-Stop date of 16 or more rounds.
Select the "middle" reward from Kyu for saving the universe.
Return the Nymphojinn to a satisfied slumber.
Return the Nymphojinn to a satisfied slumber on Incel/Femcel (Hard) difficulty.
Collect enough fairy wings to summon the Nymphojinn.
Successfully complete a date with both girls having maxed out passion, sentiment and stamina.
Successfully complete a date with at least 20 moves remaining.
Earn your first pair of fairy wings.
Earn your first pair of fairy wings within one in-game day.
Successfully complete a date wherein the girls become exhausted or upset at least 8 times between them.