Here is the full list of all 46 Omega Labyrinth Life achievements.
Spoke to both Greedrat and Petal Gob at least once.
Upgraded Luster Value for the first time.
Restored 3 areas of the garden.
Changed leaders a total of 10 times.
Restored 1 area of the garden.
You've obtained all achievements.
Acquired all Gallery Keys.
Acquired all expansions.
Fully restored the garden.
Pai has appeared.
Befriend all main characters.
Cleared Hinata's trial.
Cleared Berune's trial.
Cleared Mei's trial.
Cleared Mio's trial.
Cleared Nanami's trial.
Cleared Juri's trial.
Cleared Yurika's trial.
Viewed all stories.
Emerged victorious in the final battle.
Cleared a Sage's Trial.
Cleared Rinka's Test Site.
Cleared the Secrets of the Clock Tower.
Cleared A Distant Garden
Gathered more than 100,000 ωP.
Gone on more than 100 adventures.
Defeated more than 1,000 monsters.
Successfully stole from the shop.
Upgraded Luster Value more than 100 times.
Viewed all main characters' spa events.
Had all characters attain Z Bust Mode.
Achieved a score of 200,000 or higher.
Defeated the Reaper.
Assimilated for the first time.
Reached a Luster Value of +99 on a piece of equipment.
Harvested flowers 200 times.
Accumulated more than 200,000 μ of Nectar.
Reached Hyper L mode.
Maxed out all skills for all characters.
Used a mic with all playable characters.
Completed the Item Codex.
Completed the Monster Codex.
Completed the Synthesis Codex.
Completed the Flower Codex.
Completed the Object Codex.
Collected seeds 200 times while in dungeons.