Here is the full list of all 59 The Bard's Tale IV: Director's Cut achievements worth 1,000 gamerscore.
Create a Rogue as your starting character
Create a Fighter as your starting character
Create a practitioner as your starting character
Keep Melody as your starting character
Have a Practitioner attain the Magician class
Have a Practitioner attain the Summoner class
Have a Bard attain the Troubadour class
Save the world
Complete the final dungeon
Kill Bishop Henred
Defeat Tarjan
Have a Practitioner attain the Archmage class
Hire a mercenary
Have a Bard attain the Minstrel class
Unlock the magic within a puzzle weapon's hilt
Defeat Lagoth Zanta
Unlock the magic within a puzzle weapon's grip
Have a Bard equipped with both the Jester's Shoes and Jester's Cap
Reach level 20
Defeat Mangar
Have a Practitioner attain the Sorcerer class
Have an adventurer attain the Saint class
Find the Strifespear
Slay a corrupt paladin
Have a Rogue attain the Shadow class
Hoard 10,000 gold
Have a Fighter attain the Champion class
Reach level 18
Have a Rogue attain the Dirty Fighter class
Find the Destiny Wand
Have a Fighter attain the Commander class
Have a Rogue attain the Thief class
Clear the corruption in the Forest of the Inchriach
Have a Fighter attain the Veteran class
Have a Bard attain the War Chanter class
Have a Rogue attain the Infiltrator class
Have a Fighter attain the Defender class
Have a Fighter attain the Vanguard class
Have a Rogue attain the Assassin class
Have a Bard attain the Brewmaster class
Unlock the magic within a puzzle weapon's pommel
Find the Spectre Snare
Have a Bard attain the Rabble-Rouser class
Slay a Paladin
Defeat Gaufroi
Uncover the secret of Sinister Street
Reach level 10
Discover the gloves of the dead mage's apprentice
Defeat the wraith of Mangar
Have a Practitioner attain the Conjurer class
Activate the first set of standing stones
Unlock the secrets of a code wheel statue
Summon a Pillar of Flame
Pray to an Altar of Gratitude
Craft your first item
Create a Bard as your starting character
Defeat the final boss with only 3 party members
Clear the Stronsea Isles of Miasma
You've put King Gaerwyn to rest and restored peace in the Haernhold.