Here is the full list of all 38 Souldiers achievements.
Complete the game as an Archer.
Defeat 5,000 enemies.
Find all of the hidden rooms.
Complete the game on Warrior mode.
Complete the game as a Scout.
Complete the Bestiary in your Encyclopaedia.
Defeat Beigon on Soldier or Warrior mode.
Reveal 100% of every map.
Upgrade your protection the highest level.
Upgrade your weapon to the highest level.
Collect all secondary weapons.
Defeat Agginox on Soldier or Warrior mode.
Defeat all Dark Warriors.
Collect all Dark Crystals.
Defeat Galath a second time.
Complete all side quests.
Defeat 50 enemies using secondary weapons.
Defeat Ratatosk on Soldier or Warrior mode.
Destroy 3,000 environmental objects.
Collect all orbs in the game.
Defeat Project S on Soldier or Warrior mode.
Inflict altered states on your enemies 50 times.
Discover 50 hidden rooms.
Defeat Birk on Soldier or Warrior mode.
Defeat Brigard.
Defeat Sangrigor.
Defeat Babylon on Soldier or Warrior mode.
Use 100 potions.
Defeat 1,000 enemies.
Defeat all Royal Scorpions.
Defeat the Minotaur
Defeat Iktala on Soldier or Warrior mode.
Be revived by the Valkyries after falling in combat.
Destroy 10,000 environmental objects.
Complete the game as a Caster.
Complete the game as all three classes.
Unlock all skills.
Finish a game on Game+ mode.