Here is the full list of all 50 Dragon's Dogma: Dark Arisen achievements worth 1,000 gamerscore.
Completed the adventure a second time.
Enlisted a large number of pawns.
Obtained 350 pieces total of weapons and armor.
Defeated the Ur-Dragon.
Completed all pre-planned, non-notice board quests.
Earned a total of 10,000,000G.
Completed 50 notice board quests.
Acted as a reliable travel companion.
Put an end to all things.
Dealt the blow of deliverance.
Took refuge in an illusion.
Soar unto a new world.
Escaped the yoke of eternity.
Defeated a drake, wyrm, and wyvern.
Defeated a hydra or archydra.
Visited 150 locations.
Defeated an evil eye.
Peered into the very depths of the world.
Strengthened equipment in wyrmfire.
Accepted the Godsbane blade.
Obtained the almighty power of sovereignty.
Gave 50 presents.
Entered the duke's manse.
Completed the urgent mission.
Received the duke's commendation.
Directly enlisted a pawn to your party.
Defeated 3,000 enemies.
Changed your main pawn's vocation.
Changed your vocation.
Learned all the skills of a single vocation.
Entered the Soulflayer Canyon.
Raised a person's affinity to the maximum.
Attended an audience with the duke.
Visited 100 locations.
Entered the southwestern caves.
Helped Madeleine open her shop.
Used a Wakestone to restore the dead to life.
Obtained a forgery.
Entered the ancient quarry.
Dressed a male party member in women's clothing.
Received a writ from the castle.
Visited 50 locations.
Entered Gran Soren.
Earned the approval of the Enlistment Corps.
Entered the azure caverns.
Enlisted a pawn to your party from beyond the rift.
Summoned your own pawn.
Departed from Cassardis.
Combined two materials to make an item.
Completed the prologue.