Here is the full list of all 46 The Lord of the Rings: War in the North achievements worth 1,000 gamerscore.
Complete a playthrough on Legendary difficulty.
Slay one enemy together with 2 other players.
Complete a playthrough on Heroic difficulty.
Equip all parts of an armor set.
While in Hero Mode, perform a streak of 50 hits.
Unlock every active-cast ability in one character’s skill tree.
Absorb 25,000 total damage during the course of 1 level.
For one character unlock every skill that provides a modification to War Cry, Sanctuary or Evasion.
Defeat Agandaûr without the aid of Beleram.
Complete a playthrough on at least Normal difficulty.
Defeat Sauron's Lieutenant Agandaûr.
Kill 4 enemies simultaneously.
Complete the investigation of the Cult of the Lidless Eye.
Help weather the siege of Nordinbad.
Meet a dragon and survive.
Achieve level 20.
Complete 15 quests in a single playthrough.
Slay Saenathra.
Free the elf from his captors in Mirkwood Marsh.
Discover 25 secrets in a single playthrough.
Defeat the Sorceror Wulfrun.
Amass 25,000 coins.
Kill 50 enemies with headshots in a single playthrough.
Create 15 potions in a single playthrough.
Help destroy the citadel within Mount Gundabad.
Kill 150 enemies with war machines in a single playthrough.
Deal 3000 damage with a single ranged strike.
Slay the wild snow trolls.
Summon Beleram 10 times in a single playthrough.
Slay Bargrisar the stone giant.
Locate 5 gilded treasure chests in a single playthrough.
Kill 600 enemies in a single playthrough.
Speak with Frodo in Rivendell.
Learn of the Ring of Power and the plan for its destruction.
Defeat the Barrow Wight Lord.
Discover what happened to the missing Rangers.
Achieve level 10.
Achieve at least 1 rank in a tier 3 skill.
Defeat Agandaûr's lieutenant Tharzog.
Deal 1500 damage in a single melee strike.
Kill 200 enemies in a single playthrough.
Slot an elfstone into an item.
Join forces with the sons of Elrond.
Help free the Great Eagle Beleram.
Revive a fallen ally.
Perform 3 critical hits within 10 seconds.