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