Here is the full list of all 18 The Charnel House Trilogy achievements. It takes around 1-2 hours to unlock all of the achievements on Windows.
You logged in and tracked your parcel.
You suffered a great loss.
You saved Lang from boredom.
You discovered Alex's identity crisis.
You discovered the autobiographical element.
You met the master.
You endured Floyd's torment.
You tried to save Don from boredom... but failed.
She's a stubborn old gal.
Should've got a ring with it.
You accepted Floyd's gift.
You made Carli mad.
You scared off your stalker... for now.
Smoking really IS hazardous.
You saved Carli.
You found out the truth about Gavin.
You recounted Lydia's story perfectly.
You pulled out an old trick.