Here is the full list of all 9 Endless World achievements.
End with the top 20 ranking in a Sprint for 1 times
Win 10 Encounter battles
Evolve mercenaries for 3 times
Make 10 purchase in Taverna
Collect Artifact form - Gaea's Shield
Upgrade Lunar Power to Lvl 10
Reach Level 90
Defeat 20 Mimics
Recruit 10 Mercenaries