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