Here is the full list of all 28 Doomsday on Demand achievements.
A special day.
Meet some new people.
Threaten Ivan to kill him the first day.
Pick Bradley as your best friend.
Pick Abbie as your best friend.
Meet people with a similar fate.
Set your goal to find your parents.
Set your goal to find a safe place.
Set your goal to kill Ivan.
Save Malcolm from the Slimer.
Save Ryan from the Wack.
Meet someone new.
Complete your goal of finding your parents.
Steal Lizzie's knife.
Report to Ivan every time.
Kill Carl.
Kill Ivan as promised.
Help Carl escape.
Save Lizzie.
Let Lizzie die.
Find a safe place where no harm can find you.
Ending 1 - Live a rich, problem-free life with the Dives.
Ending 2 - Rule a democratic Arkadios with Ryan.
Ending 3 - Live peacefully with Lizzie after destroying the district.
Ending 4 - Fend for yourself on your own.
Ending 5 - Death.
Ending 6 - Lead Arkadios and the district in an autocratic way with Ivan.
Finish the game.