Offline-Only!(Talon)

Achievement Unlocked! "Offline-Only!"

You beat a dungeon solo, without abusing Purify! Maybe you're not totally worthless.

+25 EXP from all future Dungeon Completions

Double $$$ rewards from all future Dungeon Completions

Receive Zone Customization Points from all future Dungeons completed solo!

Reference
Unlocked in Chapter 33 "Gildarts Clive"