The Dungeon Pack: Seeker of the Deep! Add-on for Lost Odyssey has 6 achievements worth 100 gamerscore.
Defeated Killalon in Professor K's Dungeon.
Reached Conference Area 25B in Professor K's Dungeon.
Reached Conference Area 20B in Professor K's Dungeon.
Reached Conference Area 15B in Professor K's Dungeon.
Reached Conference Area 10B in Professor K's Dungeon.
Go to Conference Area 5B in Professor K's Dungeon.