Here is the full list of all 54 Numantia achievements.
Finish the Numantian campaign.
Let Avaros escape.
Execute Avaros.
Finish chapter 11 of the Numantian campaign.
Finish chapter 10 of the Numantian campaign.
Perform a six hexen Charge.
Kill two units from a distance and in a row using Ambo.
Refuse a sacrifice to the gods.
Let Leuco lead a suicide mission.
Finish chapter 9 of the Numantian campaign.
Let Ambo lead a suicide mission.
Finish chapter 8 of the Numantian campaign.
Steal a Roman banner.
Finish chapter 7 of the Numantian campaign.
Spent a night in company.
Finish chapter 6 of the Numantian campaign.
Let the warriors enter Numantia.
Let the merchants enter Numantia.
Finish chapter 5 of the Numantian campaign.
Finish chapter 4 of the Numantian campaign.
Finish chapter 3 of the Numantian campaign.
Teach Megara and Rhetogenes a lesson.
Finish chapter 2 of the Numantian campaign.
Foresee the fate of Megara.
Foresee the fate of Rhetogenes.
Finish chapter 1 of the Numantian campaign.
Finish the Roman campaign.
Finish a campaign in Legionnaire difficulty (Normal).
Let Scipio honor the death of a soldier.
Finish chapter 10 with Rome.
Obtain 10 items in any campaign.
Finish chapter 9 with Rome.
Kill a Devoti unit using a Standard-bearer unit.
Finish chapter 8 with Rome.
Question Scipio's orders.
Level up any heroe to level 3.
Finish chapter 7 with Rome.
Kill a slinger unit with Greek archers.
Execute Corvinus.
Let Corvinus escape.
Finish chapter 6 with Rome.
Take down Rhetogenes using a scorpio.
Finish chapter 5 with Rome.
Choose the right answer.
Finish chapter 4 with Rome.
Write a letter for Corvinus.
Finish chapter 3 with Rome.
Perform a Counter charge using Asellius.
Write a letter for Asellius.
Finish chapter 2 with Rome.
Inflict more than 180 damage in one attack.
Finish chapter 1 with Rome.
Finish a campaign in Centurion difficulty (Hard).
Ignore Corvinus' insubordination.