There are 5 scenarios in the Tariq ibn Ziyad campaign:
1. The Battle of Guadalete
2. Consolidation and Subjugation
3. Divide and Conquer
4. Crossing the Pyrenees
5. Razzia
Win every scenario of the campaign using the cheat code “i r winner”. Then, to trigger the achievement, win any scenario of any campaign without using cheat codes. The quickest scenario is the 1st scenario of the William Wallace Learning Campaign: Marching and Fighting.