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