Here is the full list of all 8 Sole Saga Demo achievements.
Complete 13th Battlefield - Chaos 1.
Complete 13th Battlefield - Chaos 2.
Complete 13th Battlefield, Chaos 2 using Blade Dancer.
Kill 50 monster by using any skills.
Complete 13th Battlefield - Chaos 3.
Complete13th Battlefield Chaos 3 with Heroics 1
Complete13th Battlefield Chaos 3 with Heroics 2
Complete 13th Battlefield Chaos 3 with Heroics 3