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