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