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!
Used Jabu to clear Survival! (Any class)
Used Rhadamanthys to defeat Orphee, Sorento and Mime 3 times each!
Used Siegfried to defeat all of the Marinas!
Used Deathmask (Surplice) to defeat Mu after being hit by his Crystal Wall!
Used Alberich to defeat all of the God Warriors!
Used Poseidon (Tuxedo) to defeat Athena 3 times!
Used Mu to defeat Deathmask (Dark Cloth) and Aphrodite (Dark Cloth) 3times each!
Used Kaasa to defeat Seiya, Shun, Hyoga and Ikki!
Used Ichi to clear Survival! (Any class)
Completed the Silver Survival Class!
Performed 50 Cosmic K.O.s!
Completed the Bronze Survival Class!
All God Cloth Gold Saints have all been unlocked!
Maxed out Assist Phrase slots!
Unlocked all of the Gold Saints!
All God Cloth Bronze Saints have all been unlocked!
Collected 50% of Assist Phrases!
Cleared all chapters in Legend of Cosmo to 100%!
Cleared the Hades arc in Legend of Cosmo!
Obtained 100% of possible "S" clear ranks 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!
Cleared the Poseidon arc in Legend of Cosmo!
Cleared 50% of the challenges in Legend of Cosmo!
Hit with a total of 30 Big Bang Attacks!
Acquired a total of 100,000 CP!
Cleared the Asgard arc in Legend of Cosmo!
Unlocked all of the God Warriors!
Experienced the Tutorial!
Cleared the Sanctuary arc in Legend of Cosmo!
Cleared your first challenge!
Obtained first "S" clear rank! (Any mode)
Acquired all Trophies!
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 100% of Assist Phrases!