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