Here is the full list of all 38 Souldiers achievements.
Complete the game as a Scout.
Complete the Bestiary in your Encyclopaedia.
Defeat Beigon on Soldier or Warrior mode.
Destroy 10,000 environmental objects.
Defeat Agginox on Soldier or Warrior mode.
Defeat all Dark Warriors.
Defeat Ratatosk on Soldier or Warrior mode.
Defeat Galath a second time.
Defeat 5,000 enemies.
Collect all orbs in the game.
Defeat Project S on Soldier or Warrior mode.
Inflict altered states on your enemies 50 times.
Defeat Birk on Soldier or Warrior mode.
Defeat Brigard.
Defeat Sangrigor.
Destroy 3,000 environmental objects.
Discover 50 hidden rooms.
Defeat Babylon on Soldier or Warrior mode.
Defeat all Royal Scorpions.
Defeat Iktala on Soldier or Warrior mode.
Defeat the Minotaur
Defeat 1,000 enemies.
Use 100 potions.
Defeat 50 enemies using secondary weapons.
Be revived by the Valkyries after falling in combat.
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.
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 game on Warrior mode.
Finish a game on Game+ mode.