Here is the full list of all 35 Monochrome Order achievements.
Cleared the ending "Dragon's Pardon."
Cleared all endings.
Cleared the ending "A New Order."
Defeated Despair Dragon.
Defeated all boss enemies.
Defeated Anarchaos.
Defeated the Betrayer.
Defeated Calamititan.
Gained 200,000G.
Cleared the ending "Divine Enemy Protector."
Cleared the ending "Inevitable Destruction."
Gained 100,000G.
Economy has fallen to -30 or lower.
Peace has fallen to -30 or lower.
Cleared the ending "An Organization in Pieces."
Fame has risen to 30 or higher.
Won 250 battles.
Gained 10 party members.
Completed 30 Judgments.
Gained 7 party members.
Tempered a weapon to Lv. 50.
Peace has risen to 30 or higher.
Economy has risen to 30 or higher.
Completed 20 Judgments.
Fame has fallen to -30 or lower.
Gained 5 party members.
Tempered a weapon to Lv. 35.
Won 100 battles.
Won 50 battles.
Won 10 battles.
Tempered a weapon to Lv. 15.
Completed 10 Judgments.
Gained 1,000G.
Completed 3 Judgments.
Gained 3 party members.