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