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