Here is the full list of all 44 Warriors Orochi 3 Ultimate achievements worth 1,000 gamerscore.
Defeated 10,000 enemies.
Used a special Triple Rush attack.
Unlocked Momiji, Kasumi, Sterkenburg and Sophitia as playable characters.
Found Kyūbi's nine tails and defeated them.
Used the Craft command for the first time.
Cleared the stage "Revenge of the Fox" in Story Mode.
Cleared the stage "Rescue of the Mystics" in Story Mode.
Maxed out the Bonds with one of the following officers: Momiji, Kasumi, Sterkenburg or Sophitia.
Cleared the stage "Escape from the Mystic Realm" in Story Mode.
Changed the color of an officer's costume.
Found Kyūbi's tail and defeated it for the first time in Story Mode.
Cleared the stage "Showdown at Odawara Castle" in Story Mode.
Cleared the stage "War against the Serpent King" in Story Mode.
Completed a request for the first time in Gauntlet Mode.
Unlocked Yinglong as a playable character.
Cleared the stage "Battle of Itsukushima" in Story Mode.
Cleared the stage "The Imprisonment of Tamamo" in Story Mode.
Promoted a single officer a total of 3 times.
Summoned an ally for the first time in Gauntlet Mode.
Cleared a stage for the first time in Gauntlet Mode.
Obtained a Mystic Weapon for the first time.
Performed a mounted True Triple Attack.
Played a match online or with another player for the first time in Duel Mode.
Cleared a battlefield in Musou Battlefields for the first time.
Defeated an Otherworld Invader in Gauntlet Mode.
Played Survival for the first time in Duel Mode.
Used a True Musou Burst.
Changed your character's battle style.
Obtained a Scroll of Enlightenment.
Used an aerial Special Attack.
Used a Strategy Card for the first time in Duel Mode.
Played a match against the CPU for the first time in Duel Mode.
Accomplish all of the Achievements in the game.
Obtain all of the Strategy Cards in the game.
Perform all of the special Triple Rush attacks.
Obtain all of the Mystic Weapons.
Make it through 50 Survival battles in Duel Mode.
Use the Craft command 100 times.
Unlock all of the playable characters within Gauntlet Mode.
Complete all of the requests within Gauntlet Mode.
Clear all of the stages within Gauntlet Mode.
Clear Gauntlet Mode for the first time.
Clear 5 straight stages in Gauntlet Mode.
Perform a Formation Attack in Gauntlet Mode.