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