Here is the full list of all 38 Souldiers achievements.
Destroy 10,000 environmental objects.
Complete the game as a Caster.
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.
Reveal 100% of every map.
Collect all secondary weapons.
Find all of the hidden rooms.
Collect all Dark Crystals.
Complete all side quests.
Defeat Agginox on Soldier or Warrior mode.
Defeat all Dark Warriors.
Defeat Galath a second time.
Defeat 5,000 enemies.
Destroy 3,000 environmental objects.
Discover 50 hidden rooms.
Defeat 50 enemies using secondary weapons.
Defeat Ratatosk on Soldier or Warrior mode.
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.
Inflict altered states on your enemies 50 times.
Defeat Babylon on Soldier or Warrior mode.
Use 100 potions.
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.
Complete the game as a Scout.
Complete the game as an Archer.
Complete the game as all three classes.
Unlock all skills.
Complete the game on Warrior mode.
Finish a game on Game+ mode.