The Last Remnant

It's actually much harder than that. There are a total of 6 steps to follow to unlock this one. All of them are tied to the Golden Chalice Guild tasks.

1. Obtain "Union of the Golden Chalice Rank 1" by completing Guild Task 14: Kill the Bloodthirsty Beast (Ivory Peaks)

2. Obtain "Union of the Golden Chalice Rank 2" by completing Guild Task 16: Kill Sledgehammer (Catacombs, Eastern Area)

3. Obtain "Union of the Golden Chalice Rank 3" by completing Guild Task 18: Kill Whitehorn (Aveclyff, Upper Level)

4. Obtain "Union of the Golden Chalice Rank 4" by completing Guild Task 20: Kill Nightingale (Fornstrand, Starry Shore)

5. Obtain "Union of the Golden Chalice Rank 5" by completing Guild Task 10: Kill two Brynhildr (Mt. Vackel, Pearly Peak or Ancient Ruins: Motopon Tier - Notus)

6. Obtain "Candle" by completing Guild Task 24: Kill Monopole (The Sacred Lands)

After completing each step in this order, go back to the Golden Chalice Guild and report your hunt, obtaining the different ranks one by one. You can hunt down all the monsters before reporting and then collecting all the rewards at the end, but it's always good to keep track of what you did by reporting directly. Of course, each one of these monsters is a rare one and has specific spawn conditions. A very good and detailed guide is available here: http://www.xbox360achievements.org/game/last-remnant/guide/ (credits to The Pants Party, x360a Community).