Here is the full list of all 12 Vandal Hearts: Flames of Judgment achievements worth 200 gamerscore.
Earned both endings to the game.
Finished Act IV with the Altyria ending.
Finished Act IV with the Luce ending.
Discovered every battle map.
Finished Act III.
Raised a weapon skill to rank 25.
Finished Act II.
Discovered an optional battle map.
Won a battle with 6 surviving party members.
Finished Act I.
Found a hidden item on a battlefield.
Executed a Team Attack.