Here is the full list of all 50 Saint Seiya: Soldiers' Soul achievements.
Completed the Galaxy War Gold Cup!
Used Mu to defeat Deathmask (Dark Cloth) and Aphrodite (Dark Cloth) 3times each!
Used Deathmask (Surplice) to defeat Mu after being hit by his Crystal Wall!
Used Alberich to defeat all of the God Warriors!
Used Jabu to clear Survival! (Any class)
Used Kaasa to defeat Seiya, Shun, Hyoga and Ikki!
Used Rhadamanthys to defeat Orphee, Sorento and Mime 3 times each!
Used Siegfried to defeat all of the Marinas!
Collected 100% of Big Bang Attack movies in the collection!
Completed the collection!
Maxed out Assist Phrase slots!
Collected 80% of titles!
Completed the Galaxy War Silver Cup!
Used Ichi to clear Survival! (Any class)
Used Poseidon (Tuxedo) to defeat Athena 3 times!
Completed the Big Bang Survival Class!
Completed the God Survival Class!
Unlocked all of the Bronze Saints!
Unlocked all of the Silver Saints!
Unlocked all of the Gold Saints!
Unlocked all of the Marinas!
Unlocked Poseidon, Thanatos, Hypnos, Athena and Hades!
All God Cloth Bronze Saints have all been unlocked!
Collected 50% of Assist Phrases!
Completed the Galaxy War Bronze Cup!
Lost a battle without landing a single attack!
Performed 50 Cosmic K.O.s!
All God Cloth Gold Saints have all been unlocked!
Completed the Legend Survival Class!
Completed the Gold Survival Class!
Completed the Silver Survival Class!
Completed the Bronze Survival Class!
Obtained 100% of possible "S" clear ranks in Legend of Cosmo!
Cleared all chapters in Legend of Cosmo to 100%!
Cleared the Hades arc in Legend of Cosmo!
Unlocked all of the Specters!
Cleared the Poseidon arc in Legend of Cosmo!
Cleared 50% of the challenges in Legend of Cosmo!
Acquired a total of 100,000 CP!
Hit with a total of 30 Big Bang Attacks!
Cleared the Asgard arc in Legend of Cosmo!
Unlocked all of the God Warriors!
Experienced the Tutorial!
Cleared the Sanctuary arc in Legend of Cosmo!
Obtained first "S" clear rank! (Any mode)
Cleared your first challenge!
Acquired all Trophies!
Completed the Galaxy War Legend Cup!
Completed the Galaxy War God Cup!
Collected 100% of Assist Phrases!