Here is the full list of all 28 Brave Dungeon + Dark Witch's Story : Combat achievements.
Clear Godshill.
Clear Nightmare.
Beat the game in 3 hours or less.
Clear Godshill using no more than 1 character from the start of the game.
Clear Godshill with no party member being above level 20.
Deal over 30,000 damage to an enemy in one hit.
Defeat Abyssframer without anyone dying.
Defeat Parascicolder without anyone dying.
Defeat Kanpon without anyone dying.
Defeat Trider without anyone dying.
Defeat Bajel without anyone dying.
Defeat the boss of Nightmare without anyone dying.
Defeat the boss of Nightmare on Lunatic.
Get Al to level 200.
Get Papelne to level 200.
Get Rudy to level 200.
Get Stoj to level 200.
Get Mari to level 200.
Get Klinsy to level 200.
Get Neville to level 200.
Obtain every material.
Obtain every accessory.
Defeat all enemies.
Obtain all bonus effects from the Syega Shop.
Complete over 70% of the Syegacha.
Obtain all other Playing Levels.
Defeat game master.
Defeat majesty.