Here is the full list of all 64 La-Mulana achievements.
Mulbruk awakens.
Obtained the Wing
Revealed Eden.
Proved that you are indeed small.
Obtained Future Development Company
The Twin Labyrinth has opened.
Challenge the balance of the spirits
Learned ancient La-Mulana words.
Obtained the Ocarina of The Philosophers.
Obliterated Amphisbaena.
Obliterated Sakito.
Obliterated Elmac.
Obliterated Bahamut.
Obliterated Viy.
Obliterated Palenque.
Obliterated Baphomet.
Obliterated Tiamat.
Obliterated all guardians.
Completed the adventure.
Completed the entire adventure within 40 hours.
Completed the entire adventure within 20 hours.
Completed the entire adventure within 10 hours.
Obtained La-Mulana.
Obtained Beo La-Mulana.
Opened the entrance to The Gate of Time.
Filled every item slot.
Obtained all M-SX software.
Obtained all maps.
Unlocked all fairy locks.
Obtained all Life Gems.
Bought something other than "Rose & Camellia" from the reformed merman.
Unlocked the HELL TEMPLE.
Completed the HELL TEMPLE.
Obliterated all guardians in HARD MODE
Took a knee.
Dived into a pot.
Started HARD MODE.
Obliterated Zu without using the Lamp of Time.
Completed the HELL TEMPLE in HARD MODE.
Obliterated all guardians without using secondary weapons.
Obliterated all guardians without using secondary weapons in HARD MODE.
Flattened by a falling giant.
Squashed by a falling sun.
Surprised Shunderia.
Smooshed by a Super Punch.
Got the cooperation of a fairy.
I warned you.
Received damnation.
Opened the entrance to La-Mulana.
Bathed in the hot springs 100 times.
Opened all small treasure boxes.
Called a fairy from every fairy point.
Got all emails.
Listened to everything Mulbruk has to say.
Listened to everything Xelpud has to say.
Scanned all suspicious spots.
Watched the ending with the entire cast present.
Everyone in the ending has that summer feeling.
Everyone's here, but only you feel like it's summer.
Opened the backdoor to the Tower of the Goddess.
Survived the 3rd infinite corridor under your own power.
Completed the HELL TEMPLE without the Fairy's Vest.
Found every NIGORO staff member.
Ate curry in a variety of situations.