Here is the full list of all 30 To Aerthen achievements.
Find Zephyr in Kayle Woods.
Sam and Tifus have joined the fight!
The heroes were seized by Ingram.
Obtained 6 Party Members.
Break your curse in Henpur.
Encountered Selamir.
Defeated the Bandit Leader.
Reunite with Kahrin.
Encountered Selamir and Mort a second time.
Arrive to Doon.
Save Lambert.
Met the Emperor of Doon.
Grabbed the Immunity Boots.
Climbed Hyplaes Tower.
Uncovered the Flying Machine.
Activated Godroost.
Discovered and explored Snodaun Forres.
Find the Dry Palace's treasury.
Had Cecilia join the fight!
Found the Shield of Purity.
Obtained the Crystal Sceptre.
Reached Ilvorya at long last.
Defeated Mort for the final time.
Defeat two of Ilvorya's Three Generals.
Met a famous villain.
Dismantled Ilvorya's security.
Defeated the Voidlord.
Saved Aerthen.
Acquire the means to fight the Superboss.
Conquered the ultimate evil.