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