Here is the full list of all 42 Holyday City: Reloaded achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Obtain the Scuba Gear from the Marina
Unlock the Airport (Reach town lvl 22)
Unlock the City Aquarium
Reach 365 Trophies
Buy the 36th Upgrade
Play 999 hours.
Play 148 hours.
Hire the Manager "Diego, the Young"
Sign a Contract with all Agents
Reach Town Lvl 31 (Skyline City)
Unlock the Marina (Reach Town lvl 14)
City Facilities 555 total
Obtain The Golden Watch Prestige Item
Upgrade your Port to Lvl 20
Buy at least 1111 of each Business
Go max level in all Time Paradoxes in the Atomic Lab
Get your 1st Lab Profit Paradox
Sign your 1st Contract
Do the Investment "Cooling System"
Reach 150 Trophies
Unlock the events (Reach Town lvl 5)
Buy 1 of each Business
Buy at least 333 of each business
Get 1 City Facility
Get 1 of each time paradox in the Atomic Lab
Buy your 1st Upgrade
Reach 10 Trophies
Reach 50 Trophies
Reach Town lvl 2
Upgrade your Port to Lvl 2
Hire the Manager "Jimmy, The Advertiser"
Do the Investment "Scale Economy-o-meter"
Play 2 hours
Play 24 hours.
City Facilities 1200 total
Increase your Profit Paradox to Lvl 50
Buy the 96th Upgrade
Reach 580 Trophies
Reach Town Lvl 26 (Holyday City)
Obtain All the Marina Items
Buy 60 Aquarium items
Hire the Manager "Audrey, The Mystic"