Here is the full list of all 22 Aurora Dusk Demo achievements.
Meet a protectress
Meet Roxanne
Meet Shadowgate
Meet Devourer
Meet a protector
Meet Marshwald
Kill 1000 zombis
Reach level 100
Control at least 50 units
Equip a "solaris diadem"
Win a custom game
Win a skirmish game
Reach level 10
Save the city of Aurora
Defeat a minotaur
Equip a rifle
Meet Gwidion
Meet Xcillia
Meet Kerringer
Activate 'auto' mode
Meet Bear Claw
Meet Kalzehire