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