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