Here is the full list of all 80 Jacob's Quest achievements.
Start a new game.
Defeat all 37 monsters in Sand Palace.
Loot all 21 boxes in Sand Palace.
Defeat all 20 monsters in Forest of Silence.
Defeat at least 100 monsters.
Defeat at least 200 monsters.
Defeat at least 300 monsters.
Defeat at least 400 monsters.
Defeat at least 500 monsters.
Loot at least 100 treasure boxes.
Loot at least 200 treasure boxes.
Loot at least 250 treasure boxes.
Clear all 17 battlefields.
Loot all 9 treasure boxes of Hollow.
Loot all 6 treasures boxes of Forest of Silence
Defeat all 54 monsters of Wintry Cavern.
Loot all 24 treasure boxes in Wintry Cave.
Defeat all 20 Hags and Lamias of Waterfall Basin.
Loot all 19 treasure boxes of Waterfall Basin.
Defeat all 97 monsters of the Ice Pyramid.
Loot all 37 treasure boxes of the Ice Pyramid.
Loot all treasure on Hellmouth Hill!
Clear out monsters on Hellmouth Hill.
Loot all 14 treasures in the Volcano.
Clear out all 29 monsters in the Volcano!
Defeat all 93 monsters in Lava Dome.
Loot all 40 treasures in Lava Dome.
Loot all 10 treasures in Alive Forest.
Defeat all 13 Ghosts and Ghouls in Alive Forest.
Loot all 27 treasures in Giant Tree.
Defeat all 56 monsters in the Giant Tree.
Loot all treasures on Mount Gale.
Defeat all 13 monsters on Mount Gale.
Defeat all 86 monsters in Pazuzus Tower!
Loot all 16 treasures in Pazuzu's Tower.
Clear out Cormac's Ship to save Cormac(required.)
Cormac found many good things on his travels.
Prove that you are a knight.
Stopped Minotaur from killing the Forest of Silence.
Flamerus Rex has stole the Crystal of Earth. Defeat him.
Clear out all ten rounds!
An army of Mint Mints have invaded Wellspring! Defeated them all!
This time they have friends...
Completed Ice Battlefield 3
Make these all sleep with the fishes!
Clear all 10 battlefield rounds.
Clear out all 10 battlefield rounds.
Defeated the evil Ice wizard and got the crest!
Defeated the Squidite gaurding the key
Defeat the boss in Waterfall Basin.
Defeat Ice Golem and save the Water Crystal.
Defeat Ifrit in the Mine.
Defeat the hell hound at Hellmouth Hill!
Defeat the last of the viles
Defeat a hard boss
Defeat the snake lady in volcano.
Defeat the Dark King
Defeat the Gidrah
Stop the gust at Gale Mountain
Listen to Burning In Your Eyes by Kerry Jackson
Collect all the treasures on Hellmouth Hill.
Defeat all the monsters in Hellmouth Hill.
Read Katie's mom's diary.
Open the way to the Great Hall in the Tower of Babil.
Open the way to the West Wing in the Tower of Babil.
Find the legendary violet armor.
Find the legendary Meteor spell.
Find the legendary Ultimate spell.
Find the Sword of the underworld.
Defeat all the monsters in the underworld.
Find all the treasures in the underworld.