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