Here is the full list of all 41 Einlanzer achievements.
Take down a King Behemoth
Take down two King Behemoths at once
Complete Poe's sidequest in the Orc Caverns
Complete Poe's sidequest near Fusilier.
Complete Poe's sidequest in Strahl Keep.
Take down the Queen Snake side quest boss
Take down the Orc King side quest boss
Take down the Spider Queen side quest boss
Take down side quest boss Gilgamesh at the top of Death Mesa
Find the secret, hidden Paladin Sanctuary
Complete the Trial of Strength
Complete the Trial of Wisdom
Complete the Trial of Courage (Wiggle wiggle)
Beat the game on easy, medium, or hard
Beat the game on medium or hard
Beat the game on hard.
Start a new game.
Defeat secret, extreme endgame boss Saul-Rious in Yvalak's Asylum
Complete the forgotten magic tablet quest in Kuli and the Ancient Castle Ruins
Defeat 250 enemies
Defeat 1000 enemies
Defeat 3000 enemies
Defeat 5000 enemies
Complete the Trials of Ascension
Defeat the first 3 monsters in the Colosseum
Defeat the first 6 monsters in the Colosseum
Defeat the first 8 monsters in the Colosseum
Defeat all 10 of the monsters in the Colosseum
Complete the Brownies side quest in Nynnyaw.
Convince Warren to return home to Sand
Complete all three Chest Quest games in Nynnyaw
Choose to condemn Lillith to being a fallen angel
Do not allow Lillith to continue on with the party
You must choose....
Behave admirably
Behave consistently admirably
Be consistently dishonorable
Obtain the legendary Excalibur
Slay a Behemoth in Strahl Keep
Find all 8 "Lanzer Day" statues spread across Lanzer's realm