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