Here is the full list of all 12 Eternal Secret achievements.
Narumi won the beauty contest.
Meet your friend.
Join the volleyball team.
Get the bad ending.
Get a scholarship.
Meet a mysterious person.
Woke up Kenta.
Told Narumi the pizza was tasty.
Admitted that Kenta’s pizza was better.
Miss your chance to get with Narumi.
Mobilise the forces.
Get into a relationship with Narumi