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