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