Here is the full list of all 47 The Lord of the Rings: Conquest achievements worth 1,000 gamerscore.
Defeat 3 Nazgul as Aragorn in Minas Morgul ("War of the Ring" Campaign).
Complete a campaign level cooperatively.
Kill 20 enemies with Gimli in any Team Deathmatch game.
Complete the single player "Rise of Sauron" Campaign.
Defeat Gandalf as Sauron in the Shire ("Rise of Sauron" Campaign).
Kill 300 hobbits in the Shire in one playthrough ("Rise of Sauron" Campaign).
Complete the Rivendell level in the single player "Rise of Sauron" Campaign.
Complete the Weathertop level in the single player "Rise of Sauron" Campaign.
Defeat Aragorn as Saruman in Weathertop ("Rise of Sauron" Campaign).
Complete the Mines of Moria level in the single player "Rise of Sauron" Campaign.
Defeat Gimli as the Balrog in the Mines of Moria ("Rise of Sauron" Campaign).
Complete the Minas Tirith level in the single player "Rise of Sauron" Campaign.
Complete the Osgiliath level in the single player "Rise of Sauron" Campaign.
Complete the Mount Doom level in the single player "Rise of Sauron" Campaign.
Complete the single player "War of the Ring" Campaign.
Complete the Minas Morgul level in the single player "War of the Ring" Campaign.
Complete the Pelennor Fields level in the single player "War of the Ring" Campaign.
Defeat the Witch King as Eowyn in Pelennor Fields ("War of the Ring" Campaign).
Climb and kill an Oliphaunt.
Complete the Minas Tirith level in the single player "War of the Ring" Campaign.
Complete the Osgiliath level in the single player "War of the Ring" Campaign.
Heal 30 allies in one life as the mage.
Kill 25 enemies in one life with the scout's bombs.
Get picked up by a fell beast or eagle.
Kill 25 enemies in one life with the archer's fire arrows.
Get 25 headshot kills in one life as the archer.
Complete any campaign level without dying.
Complete the Mines of Moria level in the single player "War of the Ring" Campaign.
Defeat the Balrog as Gandalf in the Mines of Moria ("War of the Ring" Campaign).
Complete the Isengard level in the single player "War of the Ring" Campaign.
Kill 100 enemies in one life with the mage's fire wall.
Complete the Helm’s Deep level in the single player "War of the Ring" Campaign.
Kill 100 enemies in one life as the warrior.
Complete the training level.
Kill 20 enemies with Legolas in any Team Deathmatch game.
Capture 10 control points in ranked Conquest match.
Kill 15 players with the Mage's lightning in any ranked match.
Kill 25 players as the warrior in any ranked match.
Kill 30 enemies in a ranked Team Deathmatch match.
Kill 10 players in one life as the Witch King in any ranked match.
Capture a ring with Frodo in a ranked Capture the Ring match.
Score the most points on the winning team in any ranked online match.
Capture 3 rings in a ranked Capture the Ring match.
Headshot kill 10 players as the archer in any ranked match.
Score 30 hits on the combo counter as the warrior.
Backstab 10 players as the scout in any ranked match.
Use the scout to backstab 10 enemies in one life.