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