Here is the full list of all 48 LEGO The Lord of the Rings achievements worth 1,000 gamerscore.
Collect more than 10,000,000,000 studs. (Single Player Only)
Get 100%. (Single Player Only)
Craft every Mithril item. (Single Player Only)
Unlock all characters. (Single Player Only)
Collect all the Mithril Bricks. (Single Player Only)
Complete a level in co-op.
Complete 'The Mines of Moria' in under 15 minutes.
Collect all the Red Bricks. (Single Player Only)
During 'Prologue', jump into the fires of Mount Doom as Isildur.
Complete all the Fetch Quests in Middle-earth. (Single Player Only)
Travel to Trollshaws as Bilbo.
Travel to Isengard as every playable Hobbit.
Turn an enemy into a skeleton and make them dance.
Use the Ent Draught on Pippin.
Unlock all the Map Stones in Middle-earth. (Single Player Only)
Complete the Bonus Level.
Dress a character completely in treasure items.
Craft the Fire and Ice Bows. (Single Player Only)
Reach the top of Amon Hen without being caught once by Boromir. (Single Player Only)
Achieve True Adventurer in every level. (Single Player Only)
Throw Gimli 30 times.
Defeat 42 Uruk-hai as Legolas.
Fish perfectly 20 times by pressing the icon as it flashes.
Defeat Gollum as Gollum.
Equip Aragorn with the Mushroom Crown.
Complete 2 cooking puzzles.
Complete 'Mount Doom'.
Complete 'The Black Gate'.
Complete 'The Battle of Pelennor Fields'.
Defeat an Oliphaunt as Legolas.
Complete 'The Paths of the Dead'.
Walk into Mordor.
Complete 'Cirith Ungol'.
Complete 'The Secret Stairs'.
Complete 'Osgiliath'.
Complete 'Helm's Deep'.
Finish one of Gimli's opponents as Legolas in 'Helm's Deep'.
Complete 'Warg Attack'.
Complete 'The Dead Marshes'.
Complete 'Track Hobbits'.
Complete 'Taming Gollum'.
Complete 'Amon Hen'.
Complete 'The Mines of Moria'.
Complete 'The Pass of Caradhras'.
Form The Fellowship of the Ring.
Complete 'Weathertop'.
Complete 'The Black Rider'.
Complete 'Prologue'.