Here is the full list of all 57 Leman achievements.
Win any battle
Flee a battle
Lose the game by being defeated in battle
Win a battle with only one character
Hire the maximum of 12 characters
Have an adventurer reach level 10
Have an adventurer reach level 15
Have an adventurer reach level 20
Have a band survive 100 game days
Have a band survive a full game year
Collect 25,000 gold
Collect a horde of 100,000 gold
Amass 1,000,000 gold coins
Destroy a famous bandit (I'm pretty sure they are not giving to the poor anyway...)
Kill a troublesome orc band, before they inspire too many more followers...
Defeat the White Witch of the North in combat
Reach allied status with the realm of Man. (Best do this quickly before we are declared heretics...)
Reach allied status with the Elves (I hear their parties are really good)
Reach allied status with the Dwarf. (They have loads of jewels, you know...)
Reach allied status with the Orc. (All you need to do is drop them a few weapons...)
Complete all the Necromancer's quests
Complete all the White Witch's quests
Have a non-human in your adventuring ranks
Go exploring in the Northlands
Go adventuring in the New World
Find a dungeon, destroy its denizens, claim its riches
Conclude the Game in favour of Mankind
Conclude the Game in favour of the Orc
Conclude the Game in favour of the Elf
Conclude the Game in favour of the Dwarf
Pretty much everyone is dead, Dave...
Find and defeat a bear in comabt
Find and defeat a spider in combat
Find and defeat the legendary Kraken in combat
Find and defeat a pack of raptors
Find and defeat a sabre-toothed tiger
Find and ransack the Sacred Oak of the North
Banish the source of all evil back to whence it came
Explore the volcano, destroy its denizens, ransack its treasures
Find the legendary chasm, and claim its treasures
Defeat in combat one of the great fire drakes
Resolve one of Leman's periodic great crises
Possess a named, legendary item
Cast a spell in battle
Cast a tier III spell in battle
Compete in the infamous Pits of Greyhaven, and emerge victorious!
Win the Game and claim power in Leman....
Lose the game by running out of money
Try your hand at falconry...
Find and destroy the mysterious Temple...
Find and destroy the mysterious Ziggurat...
Recruit the infamous Bandit Queen to your party
Recruit the legendary half-ogre, Mamut, to your party