There are 6 scenarios in the Le Loi campaign:
1. The Dai Viet Uprising
2. The Mountain Siege
3. The Battle of Hanoi
4. Reaching South
5. A Three-Pronged Attack
6. The Final Fortress
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.