Here is the full list of all 19 At Home With Step-Sis Simulator achievements.
Spend the day with your step sister
Order a banana
Get hit by a bus and be reborn
Complete all challenges in Puzzle Academy
Complete Dungeon Invader
Order some donuts to go
Tour the factory
Admire your office portrait
Lose to your step-sis in blackjack
Get arrested
Help your dad with his work
Wait for dad to come home
Complete Immortal Adventures
Inspect every toilet in one simulation
Clear every level in Dungeon Invader with brother #1
win 100,000 moulders
Beat your step-sis five times in cards
Claim victory in combat as an orc
Be defeated in combat as an orc