Here is the full list of all 53 Swords and Sandals Immortals achievements.
Win a fight while your health is at less than 10%.
Defend 5 straight hits from your enemy in a single fight.
Win 50 Arena Battles
Reach level 30 with your gladiator
Do at least 1000 points of damage in a single hit.
Win a battle by pushing your enemy onto spikes.
Reach level 20 with your gladiator
Do at least 500 points of damage in a single hit.
Defeat a Grand Champion
Hit your enemy 5 times in a row without a miss.
Win a battle by pushing your enemy into a chasm.
Reach level 10 with your gladiator
Win 10 Arena Battles
Roll a 20 on the Battle Dice
Defeat a Regional Champion
Do at least 100 points of damage in a single hit.
Defeat an enemy at least 5 levels higher than you.
Defeat Bruce the Useless in combat
Win 100 Arena Battles
Win 250 Arena Battles
Have at least 1 million gold in the bank
Have at least 1000 stars in the bank
Have a character of Pure Good alignment
Meet the Little Fat Kid on your travels
Use a Stellar Crystal at every Observatory in the game
Unlock all Dungeons in the game
Visit every town in the game.
Defeat all Regional Champions
Defeat all Grand Champions
Defeat all Halloween Champions
Defeat all Observatory Champions
Complete the game in under 300 days
Witness the True Ending of the game
Experience the Bad Ending of the game
Complete the game as a Warrior
Complete the game as a wizard
Complete the game as a bard
Complete the game as a rogue
Complete the game as a priest
Complete the game as a knight
Have a character of Pure Evil alignment
Complete the game on Hellscape Difficulty for both Regular Gladiators and Arena Champions, with Tough Bosses and Permadeath On
Complete the game without losing a fight.
Reach level 40 with your gladiator
Reach level 50 with your gladiator
Reach level 60 with your gladiator
Reach level 70 with your gladiator
Reach level 80 with your gladiator
Do at least 2500 points of damage in a single hit.
Damage your enemy by throwing a potion at them.
Do at least 25 overworld mini-adventures in a game.
Fight alongside Antares in the final battle.
Complete the game with Hellscape Difficulty for regular gladiators and arena champions.