Here is the full list of all 35 Avernum: Escape From the Pit achievements.
Deliver harsh vengeance to the cruel tyrant who sent the Avernites into the underworld.
Avernum has five dragons. See if you can whittle that down a bit.
Discover a route back to the surface world. There must be one somewhere.
Destroy the demon Grah-Hoth, making Avernum safe from his menace at last.
Purge a certain powerful demon from the Tower of Magi. Phew. Hope they stay out of trouble in the future.
Sss-Thsss will trouble Avernum no longer.
Find the secret at the bottom of Lost Bahssikava.
Join the Scimitar.
Learn 6 priest spells at level 3.
Get a dread curse. Then cure it.
Meet the Archmage Erika.
Learn 6 mage spells at level 3.
Find something that lets you fly.
Have ten potions made.
Reform a legendary blade from Avernum's past.
Discover 50 locations of interest.
Steal the treasure from Gremlin's Gold.
Learn a priest spell at level 3.
Slay 1000 foes.
Enter the Castle at last.
Dig up 5 caches.
Learn a mage spell at level 3.
The mayor of Formello lost something of great value. Recover it.
Discover 10 locations of interest.
Open a secret door.
Slay 100 foes.
Purge a nefarious infiltrator from Silvar's sewers.
Escape the tunnels under Fort Avernum.
Learn 18 mage spells at level 3.
Learn 18 priest spells at level 3.
Dig up 40 caches.
Have fifty potions made.
Complete all three game-winning quests in Avernum and never set the difficulty below Normal.
Complete all three game-winning quests in Avernum and never set the difficulty below Hard.
Complete all three game-winning quests in Avernum and never set the difficulty below Torment.