Here is the full list of all 39 Arcadian Atlas achievements worth 1,000 gamerscore.
Complete introduction chapter.
Choose apprehending Lucretia over Eda's family in Chapter 1.
Choose helping Eda's family over apprehending Lucretia in Chapter 1.
Complete Chapter 1.
Complete Chapter 2's mission, The Fool.
Complete Chapter 2.
Recruit Riddel after the Lundum Hills fight in Chapter 3.
Let Riddel return home after the Lundum Hills fight in Chapter 3.
Arrive at the execution site and defend yourself.
Complete Chapter 3.
Recruit Poncho.
Save Claude's life.
Recruit Lefty.
Spend over 250,000 Arcadian at the Item Shop in a single playthrough.
Spend over 500,000 Arcadian at the Item Shop in a single playthrough.
Sell over 50,000 Arcadian in items in a single playthrough.
Read all chatter in a single playthrough.
Complete 5 tavern contracts in a single playthrough.
Complete 10 tavern contracts in a single playthrough.
Recruit 5 units in a single playthrough.
Recruit 15 units in a single playthrough.
Kill 30 Lucretian units in battle.
Kill 30 Dantalion units in battle.
Kill 20 Monster units in battle.
Trigger elemental bonus damage against a target using elemental stacking.
Trigger traps 20 times.
Kill 2 units with a single attack.
Inflict Charm Status on a unit.
Inflict Rage Status on a unit.
Inflict Blind Status on a unit.
Win 10 battles without a single unit knocked unconscious.
Learn all skills on a single skill tree in one playthrough.
Promote your first unit.
Get all Core Class specializations across troops.
Get all Advanced Class specializations across troops.
Promote units to all advanced job classes.
Dismiss a soldier from the troop roster.
Spend a total of 6 CMD Points.
Respec any unique soldier with CMD Points.