Here is the full list of all 40 Lost Ruins achievements.
Complete Hardcore Mode.
Arrive at the one true ending.
Defeat 50 enemies with ice spells.
Defeat 30 enemies with Runic spells.
Deflect 20 enemy attacks with a Katana.
Complete Assassin Mode.
Consume 100 Meat items.
Complete Witch Mode.
Defeat 44 enemies with Corpse Absorption spells.
Defeat 50 enemies with Fire spells.
Collect every weapon.
Visit every area.
Inflict 30 critical hits with Throwing weapons.
Inflict 50 critical hits with a Bow.
Defeat 50 enemies with a Sledgehammer.
Collect every piece of equipment.
Collect every Spell.
Arrive at the end.
Complete Boss Mode.
Defeat 20 enemies by using traps.
Land 50 attacks on enemies by penetrating their shields.
Open every treasure chest.
Discover another ending.
Defeat every boss.
Collect every record.
Defeat 30 Plant monsters.
Complete every quest.
Collect every artifact.
Defeat Sadora the Ascetic.
Defeat 20 enemies with a Holy Sword.
Defeat 5 Orcs.
Earn 999 gold.
Block 50 Attacks.
Defeat 60 bugs.
Hear all of the Goblin Merchant's tales.
Defeat 10 Banshees.
Destroy 5 icons.
Unlock every art piece.
Defeat 66 Demon or Undead enemies.
Defeat 47 enemies with a Gladius.