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