Here is the full list of all 46 Grand Kingdom trophies - there are 28 bronze, 15 silver, 2 gold and 1 platinum.
Prepared to flee from battle, then fled after a unit died.
Visited each capital of the Four Great Nations.
Killed an invisible unit while it was still invisible.
Reach 99 in any stat on any unit.
Performed a Class Up!
Destroyed an object while a unit was on top of it.
Obtained 20 flags.
An ally was eaten by a Slime.
Equip glasses on one of your units.
Clear a Destination Quest without engaging in battle! (Spy Quests excluded)
Adjust a quest's difficulty before clearing it.
Met and received treatment from all 4 Healing Sisters.
Die by stepping on a hazard.
Clear a Destination Quest without using field skills and items. (Spy Quests excluded)
Achieve victory with just 1 HP remaining.
Achieve victory while morale is low.
Used Grit to avoid an enemy attack.
Finished off an enemy with an Assist.
You hired a new unit.
You are now affiliated with the Guild.
Killed 2 enemies simultaneously.
Killed an enemy using knockback damage.
Attack an ally unit with an area-of-effect attack.
Congratulations on getting all the trophies!
You finally obtained a Golden Baku!
Forged something at the blacksmith.
Upgraded equipment at the blacksmith.
Synthesized equipment at the blacksmith.
Removed every type of obstacle on the field.
Walked 20000 steps.
Went to all areas on a Travel Quest.
Defeated every Bounty Head!
Leveled a unit to level 99!
Learned every possible skill on one of your units.
Obtain 150 total policy points.
Achieved Mercenary Rank of S!
Knocked back a unit 8 character-lengths.
Launched a unit 9 character-heights.
Dealt 20000 damage with one attack.
Performed a 99-hit combo during one turn.
Killed 3 enemies simultaneously!
A Rogue picked up a item containing explosives.
An ally Shaman reflected an attack to kill an enemy.
Win a battle using the Challenger's self-destruct skill, resulting in a double KO.
Defeated the Grand Mercenary Squad with a lower-level squad.
Clear a Target Quest with just one unit.