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