Searched 15 surrendered imperial soldiers.

Won 50 encounters in the overworld.

Won a 5-battle chain encounter in the overworld.

Earned an S-Rank on a mission.

Earned the "An Army of One" bonus.

Took down 100 imperial soldiers.

Won an encounter in the overworld.

Searched 3 surrendered imperial soldiers.

Talked with the moogles from all thirteen classes.

Completed an SO.

Completed Chapter 1 "War - Three Hours That Changed the World."

Proof of obtaining an elixir. It's so rare that it seems almost a waste to use it, doesn't it?