Here is the full list of all 50 Planescape: Torment: Enhanced Edition achievements.
Gave the Transcendent One an answer to a "meaningless question."
Reach level 12 in Fighter class before any other class.
Advanced Dak'kon's karach blade to highest neutral point.
Advanced Dak'kon's karach blade to highest evil point.
Join Anarchists.
Join Xaositects.
Gave birth to Adahn through belief.
Drew the Lady's Gaze and got mazed.
Escaped the Lady's Maze - this time.
Reach Evil Alignment (any).
Switch back to Fighter class over the course of the game.
Reach Chaotic Alignment (any).
Maintained True Neutral Alignment until the end of the game.
Reach level 12 in Thief class before any other class.
Issued Pronouncement of Two Deaths of One at Fortress of Regrets.
Defeated your adversary.
Your name, at last.
Kill all 3 incarnations in Fortress of Regrets.
Absorb all 3 incarnations in the Fortress of Regrets.
Entered the Fortress of Regrets on your own.
Found Pharod's Vault. It smells in there.
Returned to Mebbeth and restored Unity of Rings.
Shifted Curst back to the Outlands.
Dealt with Trias the Betrayer.
Gained Vhailor as a companion.
Advanced Dak'kon's karach blade to highest honor point.
Reach level 12 in Mage class before any other class.
Dealt with Ravel Puzzlewell.
Met all of Ravel's branching incarnations in Sigil.
Discovered your connection to Ignus.
Discovered the truth of why Morte is with you.
Helped Nordom resolve his issues.
Restored Dak'kon's faith.
Discovered why Dak'kon's faith is shattered.
Defeated the Modron Wizard.
Gained Nordom as a companion.
Gained Fall-From-Grace as a companion.
Gained Ignus as a companion.
Join Sensates.
Rescued Morte.
Join Dustmen.
Reach Lawful Alignment (any).
Advance an attribute score to 25.
Gained Annah as a companion.
Recovered the Bronze Sphere.
Train to become a Mage.
Reach Good Alignment (any).
Gained Dak'kon as a companion.
Train to become a Thief.
Escaped the Mortuary.