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