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