Here is the full list of all 44 Warriors Orochi 3 Ultimate achievements worth 1,000 gamerscore.
Cleared the stage "Revenge of the Fox" in Story Mode.
Cleared the stage "Escape from the Mystic Realm" in Story Mode.
Found Kyūbi's nine tails and defeated them.
Summoned an ally for the first time in Gauntlet Mode.
Completed a request for the first time in Gauntlet Mode.
Used the Craft command for the first time.
Cleared a stage for the first time in Gauntlet Mode.
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.
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.
Changed the color of an officer's costume.
Defeated an Otherworld Invader in Gauntlet Mode.
Maxed out the Bonds with one of the following officers: Momiji, Kasumi, Sterkenburg or Sophitia.
Performed a mounted True Triple Attack.
Unlocked Momiji, Kasumi, Sterkenburg and Sophitia as playable characters.
Promoted a single officer a total of 3 times.
Obtained a Mystic Weapon for the first time.
Used a True Musou Burst.
Changed your character's battle style.
Obtained a Scroll of Enlightenment.
Used an aerial Special Attack.
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.
Defeat 10,000 enemies.
Clear the stage "Rescue of the Mystics" in Story Mode.
Clear a battlefield in Musou Battlefields for the first time.
Clear 5 straight stages in Gauntlet Mode.
Perform a Formation Attack in Gauntlet Mode.
Play a match against the CPU for the first time in Duel Mode.
Play a match online or with another player for the first time in Duel Mode.
Play Survival for the first time in Duel Mode.
Use a Strategy Card for the first time in Duel Mode.
Use a special Triple Rush attack.