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