Here is the full list of all 31 Kingdom Eighties achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Complete a level with only two workers
Uncredited professional BMX rider making it rain coins
Recruit someone friendly
Complete a level with no more than 20 kids
Wait for the bus
Destroy a portal on Peaceful
Complete Episode IV
Get something back from the past
Rainy day at Paradise Estate with Rainbows in tow
Destroy a portal around the mall
Complete Episode III
Survive for 50 days in one level
Defeat 10 greed with a machine gun
Get eaten by a shark
Destroy a portal on the streets
Complete Episode II
Lose 80 coins to the waters
Recruit someone smart
Complete Episode I
Clear all the trees on any level
Enter a cave
Destroy another portal
Destroy a portal in a forest
Recruit someone handy
Lose the Crown, and take it back
Recruit someone athletic
Find the missing trophy
Slap a monster truck
Complete the game on Hard
Complete the game on Cursed
Complete the game in 50 days or less