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.
Complete all side quests.
Collect all Dark Crystals.
Defeat Agginox on Soldier or Warrior mode.
Defeat all Dark Warriors.
Defeat Galath a second time.
Inflict altered states on your enemies 50 times.
Defeat 50 enemies using secondary weapons.
Defeat Ratatosk on Soldier or Warrior mode.
Destroy 3,000 environmental objects.
Discover 50 hidden rooms.
Use 100 potions.
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.
Defeat Babylon on Soldier or Warrior mode.
Defeat 1,000 enemies.
Defeat all Royal Scorpions.
Defeat the Minotaur
Defeat Iktala on Soldier or Warrior mode.
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 game on Warrior mode.
Finish a game on Game+ mode.