Here is the full list of all 50 LOST SPHEAR achievements.
Defeated Dark Ruin.
Defeated Eclipse.
Obtained Tyranny Spritnite.
Obtained War Maiden Spritnite.
Obtained Raggys' Spritnite.
Obtained Rainbow Spritnite.
Landed on the moon.
Returned from the Fade Realm.
Made 30 consecutive hits.
Defeated Krom.
Used Last Elixir.
Winger acquired.
Money spent reached 500,000G.
Royal Capital Marche restored.
Unlocked all spritnite columns.
Caused 10 sublimations.
Turned into rooster.
Made 100 critical hits.
Caused 1,000 or more damage with 1 attack.
Created spritnite 50 times.
Caused 500 or more damage with 1 attack.
Created 10 artifacts.
Sea restored.
Collected from Glow Spots 100 times.
Night and day restored.
Made 10 Machine Kills.
In-battle move distance reached 1000D.
Vulcosuit acquired.
Made 10 Momentum Kills.
Ship acquired.
Made 10 evasions.
Made 15 weak-spot attacks.
Activated Momentum Mode 10 times.
Activated Momentum Mode 4 times in 1 battle.
Damaged 3 or more monsters with 1 attack.
All achievements earned.
Obtained Moon's Soul.
Obtained Sunlight Spritnite.
Obtained Chrono Spritnite.
Obtained Isolation Spritnite.
Ate Clam Soup.
Ate Moon Tripe.
Ate Fruit Jelly.
Money acquired reached 1,000,000G.
Sublimated spritnite to max level.
Used all paradigm drives.
Defeated 300 monsters with Scan.
Went fishing 30 times.
Ate 100 different foods.
Total shop sales reached 100,000G.