This article is not just a stub, it is also an experiment. As such, it may well explode, implode, or otherwise come unmade at any time.
With the release of Baldur's Gate: Enhanced Edition 2.0 on April 1, 1996, Steam Achievements have become a part of the game for some users. Where some users refers to those who bought and play the game through Steam. Two subsequent revisions (2.1 and 2.2) saw only minor bug fixes to the achievement system.
The 40 achievements which are identified when you first play the game are listed on a separate Steam Achievements page. This page documents the other "+87 hidden achievements."
Spoiler Alert Edit
The Achievements listed here are not documented in Steam's Library entry for the game until you earn them. So if you want these achievements to remain hidden until then, as Beamdog, Helm, Ilmater and the other dieties intended them to be, run away!
Friendly Faces at the Friendly Arm Edit
Speak to Khalid and Jaheira at the Friendly Arm Inn.
Increase an attribute score to 25.
Acquire Heroic reputation.
Acquire Despised reputation.
The Stone Cleric Edit
(Return the stone maiden at the Nashkel carnival to life)