Here is the full list of all 49 The Caligula Effect 2 achievements.
Acquired all trophies.
Challenged the Tower of Prometheus.
Obtained all WIRE conversation topics.
Achieve ★ Affinity with all residents of Redo.
Cleared all Solo Quests.
Completed the Causality Link chart.
Cleared "For the Love of Regret."
Cleared all Group Quests.
Cleared "Birth of a Salesman."
Cleared "From Nurse to Worse."
Completed Chapter 8.
Acquired all of χ's cover songs.
Completed all Go-Home Club members' Character Episodes.
Cleared "The Part-Time Tyrant."
Completed Chapter 7.
Completed Chapter 6.
Acquired over 50 Passive Skills for the protagonist.
Cleared "Love, Loss, and the Omega Nebula."
Learned all available skills for χ.
Began a second playthrough by loading cleared save data.
Completed a person's Character Episode.
Cleared "Hustled and Bustled."
Completed Chapter 5.
Cleared "Extra! Extra! Journalism Club Showdown."
Completed Chapter 4.
Performed over 50 successful guards.
Completed Chapter 3.
Cleared "Eat Your Heart Out."
Attained a total of 10,000 χ Points.
Successfully activated over 200 Trigger Skills.
Sold a Stigma for the first time.
Cleared "Extracurricular Affair."
Sent a set number of texts on WIRE.
Cleared "Prince of Lettuce."
Won over 200 battles.
Made over 100 friends.
Completed Chapter 2.
Landed over 100 successful Risk Breaks.
Landed over 100 successful counters.
Participated in the lottery for the first time.
Made a transaction using χ Points at the χ Shop for the first time.
Landed over 50 successful Sucker Punches.
Cleared a Solo Quest for the first time.
Completed Chapter 1.
Used an Overdose Skill for the first time.
Landed a successful Sucker Punch for the first time.
Completed the Prologue.
Used χ-Jack for the first time.
Answered Regret's call.