Here is the full list of all 13 One-Way Ticket achievements.
You miss the chance to go on board.
Begin the joureny with Horzion.
Went to every scene when free exploration.
Check the three gossip of every character when free exploration.
Killed by iwata.
Killed by amemori.
Yuuki was killed before bell rings.
Alive after the Horzion battle royale.
Enter the hidden chapter.
Reaching the highest favorability with amemori.
Reaching the highest favorability with Yuuki.
Reaching the highest favorability with yuuto.
Get all the achievement and finsh the game.