Here is the full list of all 70 After I met that catgirl, my questlist got too long! achievements.
You chose an official name for the guild!
Celia joined the guild!
Sunny joined the party!
You secretly read Téa's diary!
Reniel joined the party!
You 'established' your guild!
You started the game!
You took a day off with the girls!
You prevented a catastrophe!
Téa became your girlfriend!
Reniel became your girlfriend!
Sunny became your girlfriend!
Celia became your girlfriend!
Lyra decided to get closer to you!
You met a charm wizard!
You successfully fled Ostmoor!
You learned all of Vera's skills!
You upgraded all of Vera's skills!
You discovered many alchemical combinations!
You let Sunny throw dynamite!
You defeated your fellow challengers at the Arena!
You defeated all of the Westereya champions!
You dealt 9999 damage in one hit!
You gave Celia a day off!
You overworked Celia!
You got a Dice Delight in the casino!
You used the rose-tinted glasses!
You listened to Téa's rousing speech!
You helped Téa change the kingdom!
You did the impossible and made Téa leave!
You stayed in Morpheya with Téa!
You fled the now destroyed Elder Tree!
You helped Reniel eradicate the demon threat!
You witnessed Reniel's defiance!
You left Morpheya with Reniel!
Reniel left you in Morpheya!
Dana joined the party!
You brought Lovett to justice!
You learned Sunny's full name!
You left Morpheya with Sunny!
You left Morpheya with Sunny, but Téa...
Sunny left you in Morpheya!
You visited the Abyss with Lyra!
Raina joined the party!
You left Morpheya with Lyra!
You left Morpheya in Lyra's hands!
You succumbed to despair!
You learned of a top-secret mission from the King!
You met Negative!
Celia sacrificed herself to let Téa leave!
You stayed in Morpheya with Celia! But Téa...
You brought Gene the elixir of youth!
You found the unabridged version of the third issue!
You helped Odette and her literacy school!
You helped Alexander and his lay order!
You helped Dana make Rosedell a refuge for all!
You found Mannie's hideout!
You places a crystal at the end of the Emerald Maze!
You stopped the desertification of the Southills!
You changed the casino's tune!
You unlocked all the CGs in the gallery!
You completed Fern's questline!
You exchanged materials for money 10 times!
You helped Leon propose to his lover!
You tested your mettle against the Quizmaster!
You lit all the braziers in Ostmoor!
You helped Walter and Mavis enter a relationship!
Alexander had a spicy surprise for Odette!
Sparkles remembered about his past!
You made Tam cast 'Light of destruction'!