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