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