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