Here is the full list of all 48 LEGO The Lord of the Rings achievements worth 1,000 gamerscore.
Get 100%. (Single Player Only)
Unlock all characters. (Single Player Only)
Craft every Mithril item. (Single Player Only)
Collect all the Red Bricks. (Single Player Only)
Complete all the Fetch Quests in Middle-earth. (Single Player Only)
Collect all the Mithril Bricks. (Single Player Only)
Craft the Fire and Ice Bows. (Single Player Only)
Collect more than 10,000,000,000 studs. (Single Player Only)
Achieve True Adventurer in every level. (Single Player Only)
Dress a character completely in treasure items.
Turn an enemy into a skeleton and make them dance.
Complete the Bonus Level.
Travel to Trollshaws as Bilbo.
Travel to Isengard as every playable Hobbit.
Unlock all the Map Stones in Middle-earth. (Single Player Only)
Use the Ent Draught on Pippin.
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'.
Equip Aragorn with the Mushroom Crown.
Defeat Gollum as Gollum.
Complete 'Osgiliath'.
Complete 'Helm's Deep'.
Defeat 42 Uruk-hai as Legolas.
Finish one of Gimli's opponents as Legolas in 'Helm's Deep'.
Complete 'Warg Attack'.
Complete 'Track Hobbits'.
Complete 'The Dead Marshes'.
Complete 'Taming Gollum'.
Complete a level in co-op.
Fish perfectly 20 times by pressing the icon as it flashes.
Complete 'The Mines of Moria' in under 15 minutes.
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'.
Throw Gimli 30 times.
Form The Fellowship of the Ring.
Complete 2 cooking puzzles.
Complete 'Weathertop'.
Complete 'The Black Rider'.
Complete 'Prologue'.
During 'Prologue', jump into the fires of Mount Doom as Isildur.