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