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