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)
Collect all the Red Bricks. (Single Player Only)
Turn an enemy into a skeleton and make them dance.
Craft the Fire and Ice Bows. (Single Player Only)
Complete the Bonus Level.
Throw Gimli 30 times.
Travel to Isengard as every playable Hobbit.
Travel to Trollshaws as Bilbo.
Dress a character completely in treasure items.
Fish perfectly 20 times by pressing the icon as it flashes.
Use the Ent Draught on Pippin.
Achieve True Adventurer in every level. (Single Player Only)
Unlock all the Map Stones in Middle-earth. (Single Player Only)
Reach the top of Amon Hen without being caught once by Boromir. (Single Player Only)
During 'Prologue', jump into the fires of Mount Doom as Isildur.
Complete 'The Mines of Moria' in under 15 minutes.
Complete 2 cooking puzzles.
Defeat 42 Uruk-hai as Legolas.
Equip Aragorn with the Mushroom Crown.
Defeat Gollum as Gollum.
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'.
Complete a level in co-op.