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