For the maps with hidden treasures, obtain the treasure on the first playthrough of the map or else, on a second attempt of the map, the treasure will be downgraded to easily obtainable items such as Hide Caps, Mage Oils, and Herbs.
Unlock the following bonus battle maps by performing the corresponding tasks:
BONUS MAP - HOW TO UNLOCK Avery Fields - Examine the well at the top of the Church of Restoration during your second visit. Foreign Quarter - Examine the barrel to your left at the start of the Biruni University stage. Four Swordsman Spring - Examine the hollowed out tree at the dry riverbed. Gillbaris Gardens - Examine the skeleton on the opposite side of the central tree from the chest in the Timion Vale mission. Halls Of Atonement - Examine the king's throne in the Royal Courtyard. Keliask's Tomb - Examine the glimmering tablet on the ground in the ancient ruins. Ragnar's Gorge - Examine one of the crates during the mission in Tolby. Trivishim's Corridor - Use the second mine cart in Dread to open up a cave entrance. Wanderlust - Beat all story and optional battles two times.
ACHIEVEMENT - HOW TO UNLOCK Treasure Hunter (10 points) - Find a hidden item on a battlefield. Tag Team (10 points) - Perform a Team Attack. Zero Casualties (15 points) - Win a battle with 6 surviving party members. Explorer (15 points) - Discover an optional battle map. Revelations (15 points) - Finish Act I. Sandworm Slayer (15 points) - Finish Act II. Royal Defender (15 points) - Finish Act III. Weapon Mastery (25 points) - Raise a weapon skill to rank 25. Wanderlust (25 points) - Discover all battle maps. Champion of Sostegaria (20 points) - Finished Act IV with the Altyria ending. Hero of Sostegaria (20 points) - Finished Act IV with the Luce ending. Serenity and Fury (15 points) - Earned both endings to the game.