Here is the full list of all 23 Denizen achievements.
Travel at least 10,000 steps in one day
Reach the highest rank as a pizza cook
Open a retail store
Reach a bank account balance of $1,000
Reach a bank account balance of $10,000
Reach a bank account balance of $100,000
Reach a bank account balance of $1,000,000
Break into a building
Stay awake for 24 hours straight
Reach the highest rank as a forklift operator
Purchase a vehicle
Complete all of Austin's missions
Travel a total of 100 floors in elevators
Purchase a residential property
Win a slot machine jackpot
Reach the highest rank as a bartender
Take a vehicle through a car wash
Visit Vault Nightclub
Invite a friend over
Rent a residential property to a tenant
Catch a fish
Share a home with someone
Reach the maximum fishing skill level