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