No missable achievements (plus 35 unknown)
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Escape the caves above Fort Ganrick.
Open a secret door.
Meet an envoy from the deepest caves.
Discover 20 locations of interest.
Survive a long river journey.
Learn a mage spell at level 3.
Return to Avernum from the depths.
Learn a priest spell at level 3.
Dig up 10 caches.
Discover 70 locations of interest.
Find each class of Empire pass.
Meet the greatest mage in Avernum.
Fully prove your worth to Avernum.
Escape the bonds of gravity.
Avenge the lost Avernites of Cotra.
Return a Crystal Soul.
Sanctify 5 altars.
Learn 8 priest spells at level 3.
A sharp knife. Find one.
Have ten potions made.
Learn 8 mage spells at level 3.
Get a really sweet sword.
Keep the Empire from flooding Avernum with troops.
Win Avernum a powerful ally in its war.
Slay the commander of the invading army.
Complete all three game-winning quests in Avernum 2 and never set the difficulty below Normal.
Fill up a spirit prism.
Dig up 40 caches.
Have fifty potions made.
Learn 20 priest spells at level 3.
Learn 20 mage spells at level 3.
Make there be one fewer dragon. (Normal difficulty or higher.)
Complete all three game-winning quests in Avernum 2 and never set the difficulty below Hard.
Complete all three game-winning quests in Avernum 2 and never set the difficulty below Torment.